I have noticed that the DEV team has been adding more facelifts and helping concepts to ESO. I'm leaving this post in the hope they may see this.
Since the beginning of time, the guild system in ESO has been very bare bones. Invite members who can get into a bank. Over time players have created guilds forming trading guilds, pvp guilds, and pve guilds. (sometimes a mix) However, some of the staple situations they have to perform are not really supported through the UI in the game.
Some things I can think of is:(a lot of these are solved with add-ons..)
Trader Guild Basis
1. Knowing how long a character has been in the game(concept: Kicking Inactives).
2. How much they donate, purchase, or sell goods. (again to help with who to kick based on sales)
3. *A better system to keep traders in general.. numbers don't seem to add up when it comes to what is taken out of a sale.*
PVE Based Guilds
1. Perhaps buffs for a Pledge group of all guild members?
2. A point system to level your guild? to maybe allow more buffs.. which are given to your guild for completing trials on vet or dungeons on vet??
PVP Based Guilds
1. Didn't think this far!.. sorry
I hope this gets some wheels moving on some long-awaited systems to make life in the game easier.