Crafting:
- A new tier of items that are craft-only, so people who invest in crafting actually have a purpose at end game.
- Skills in the hard crafting lines that allow them to repair items without a kit. Again, let them actually have something to do.
- Either remove the Bind from transmuting, or make it so you can transmute without researching that trait. The current system of limiting crafters while simultaneously punishing those who don't want to craft is just terrible.

Classes/Roles:
- A redesign/revert of classes to give them genuinely unique mechanics, then a restructure of the class skill lines to allow players to utilize those mechanics in various roles instead of being constantly forced into using general skills.
- Shrink the number of ways players can get certain buffs and utilities so not everyone is running around with everything all the time. There's currently no space for any sort of support-DPS or something because any player can pretty much get 100% uptime on Brutality/Sorcery, Savagery/Prophecy, Resolve/Ward, Fracture/Breach, Force, and still have space for shields, healing, dots, and spammables.

Combat:
- Removal of damage scaling based on max resources. The number one reason hybrid builds suck. We already have Weapon and Spell damage and crit, so use those.
- Rework of light attacks. Their current state is a big part of what makes playing any character feel the same. LA > Skill all day every day is very boring.
- Fewer, deadlier enemies, especially in dungeons. Group play feels more like an aRPG right now, where you just zoom out your camera, stack hordes of mindless mobs and nuke them over and over and over and over and o-
- Rework of CC on bosses. I understand that you can't make Trial bosses as susceptible to CC as an overland mob for balance reasons, but too many skills become useless in PvE because they can't be used in 50% of the engagements.

And a whole slew of other things that people have already mentioned. To be honest, I'm starting to worry that there's just been too many bad decisions made over the past five years to fix them without some massive overhaul. We'll see what happens though.