Agree with most but not keen on a couple points.

Rank vouchers- You still going to have to do maintenance to apply them so you might as well utilize the Ranking system.

Raffles- With all the bugs that are in ESO, I can see this one not working well.

You are so right that the About Us needs a greater amount characters. MOTD needs to return to be used as intended. The first line in my MOTD is used as a date stamp on when I update it but I should not have to do that to get members to read it.

A Guild Calendar is needed where we can add Guild Events. Event option should be what rank level(s) can see the event as well, allows for Officer meeting notice and such. Be good to have the ESO Official events listed there automatically, would help let people plan ahead if they update it monthly but rather see three months out updates.

Sales for Guilds should have been a thing for a long time. Either have it only available to guild members or have a toggle for members only or all. On a members only could have rank permissions on buy limits so you could have low cost items that is not wiped out by one person. 200 members required to add function to guild.
A guild members only auction function would also be good. Allow for lots to be made up of single or multiple items. Rank permissions on who can add lots. Allow the guild to set how much goes to guild cut, some might like all with others a lesser amount split with seller. Of course ZOS would have their gold sink cut, the bribe to do this. 300 members required to add function to guild.
Ok, if they do those then might as well add your Raffle to members only. Again ZOS would get their gold sink cut bribe to do this but at least with these added they are helping guilds with the larger gold sink on Traders. 400 members required to add function to guild.

Permission to view guild bank by Rank. Not all guilds want all to see it. Let GM 's make the decision on how they want to operate. Would love to see the bank to be divided into sections and see those have access settings as well. Maybe in groups of 25 slots, so you say a section will have 50 slots for free for all, 400 for X-Rank and 50 for hands off.

Guild Roster should have weekly sales totals on each member. Current week able to view all sales, last week only the total for the week and then a guild lifetime total. All permissions by Rank but a member should always be able to see and access their own sales history.

With the sales on roster change your dream system could be added. A sales thresholds allowed on Ranks, rank is set with a min-max for threshold then name has a indicator they can move up or then need to move down. The rank change still should be manually done, allows for override and Officers/GM's still need to do some work.

With many of these, this will level the play experience across all platforms. Eliminating the need for PC addons and bringing those functions to consoles. Greatly expanding the QoL for all.

One last thing. Add a Forum section for Guilds and Guild Functionality. @ZOS_GinaBruno @ZOS_JessicaFolsom

EDIT: Let GM's mass mail their members by rank(s)

The sad thing is the list is quite long as they almost never add any Guild Tools functionality.

1 Performance:

1.1) Server performance is so bad during peak times it often takes several times longer than it used to put items up for sale with hanging requests sometimes forcing a player to stop interacting with the NPC and try again.
1.2 depositing/removing items from the guild bank are similarly impacted. I schedule Guild Bank maintenance to off-peak/low population times else it just eats up too much time. Not everyone has the luxury to accommodate this huge time sink.
1.3 Relax the throttling of Guild History so Master Merchant addon works better. The amount of complaints from members who just want to track their sales is a chore.
1.4 Improve guild rank changes see 3.

2 Guild Bank

2.1 A lot of guilds and almost all Trade Guilds rely on member gold deposits. However, if GM's give members permission to see their own deposits they can also see the bids which are completely unacceptable for I hope obvious reasons. Consequently, no members of Trade Guilds can see deposits into the guild including their own. This means GMs/officers are constantly fielding questions "did you receive my gold". Add some additional permissions so players can see their own withdrawals/deposits only but NOT the bids which should have its own separate permission or just link it to those that can hire.
2.2 Allow us to track member gold deposits over time. After 10 days we lose all memory that a member ever contributed to their guild. Of course, we can make manual notes which is a huge time sink and/or use Shissu Guild Tools but really this should be trackable within the games core code and visible on the roster for Guild management and of course Players to see their own contributions. As things stand after most major updates the guild management community on PC is on tenterhooks whether Shissu Guild Tools will still work and if not rely on a particularly amazing individual (thanks Splatadude) to rush out a hotfix. At some point, the addon will stop working or Splat will go play another game and we will all be royally f*****.
2.3 Compartmentalise the Guild bank so different items can be stored under different permissions so it's not an all or nothing. Make the lowest permission(s) only remove x number of items a day. Every week I hear about some too trusting and honestly naive guild getting robbed by some scumbag. This is a standard in most MMO's for 15+ years so should be doable in ESO too.
2.4 Put a variant of the 'Roomba' addon into the core code so all GMs on pc and console can enjoy stack items in Guild Banks effortlessly.
2.5 As I drift into wonderland a lottery/raffle system would be nice. GM's can add prizes and set an amount to buy a ticket. Winners have their prizes automatically sent to them. ZoS want Trade Guilds to be the main gold sink..help us by automating some of these things so we can help flush that gold out of the system and keep inflation at bay

3.Guild Roster

3.1 Allow us to track member donations over time as discussed in 2.2
3.2 Allow members and Guild Management to track member sales without the need for Master Merchant or Arkadius Trade Tools addon. At some point, these addons will stop working and no one will be willing to spend the time to fix them. The loss of these addons would significantly reduce the enjoyment to trade for many thousands of players on PC
3.3 Allow us to view via the roster when members joined a Guild.
3.4 As things stand changing guild ranks or notes is a horribly time-consuming weekly task. If you go too fast you get kicked from the server so something that could take 10 minutes often takes 30 minutes because you have to mentally hold back making a change for a few seconds to avoid the server kick every time you make a change. A more forgiving timer on these specific type of calls to the server would be appreciated. GMs have had 5 years to practice this stuff and we are quite fast at it so help us do it faster, please. I would hope these fairly rare tasks would impact the server that much that you could not double the time limit for guild roster updates.

4. Other

4.1 Do more to get rid of bots. It ruins the economy and hard work of players who like to farm for materials. Make it easier for players to raise a ticket and get some kind of feedback the time spent policing the game on everyone's behalf made a difference.
4.2 The crown exchange has opened up a back door to 'pay to win' for Trade Guilds. Now a real-life affluent GM can circumvent and fast track their guild to premium kiosks without having to put in the work to grow their guild. So we end up with real-world wealthy players pushing their guilds onto kiosks they would otherwise have no possible way of occupying and displacing well-run guilds and its members. Also frustrates players who shop at kiosks with sparse guild stores. Do not have a fix other than putting the exchange into the game and then limiting a player to gifting x amount of crowns per week which I am reticent about as I want ZoS to get as much income as possible so they can improve the game. That said this is a problem that is not going away and ZoS has a core tenet of no pay to win in their game and this breaks their promise.
4.3 Multibidding on ten is a bit much. ZoS should consider reducing it to 5.
4.4 Allow us to remove a bid up to the time they are locked at 5 mins to the last hour each week. It's too easy to make a mistake
4.5 Provide more Guild events. Members of the best selling guild on a server or even a zone receive an achievement maybe? This would also act as a massive gold sink. Of course, ZoS would need to track sales for members/guilds first see 3.2