1 - the ability to move and resize UI elements
i like having my skill bar close to the middle of the screen (right under my character) so i can track my cooldowns without having to look all the way down. FF14 and WoW both give the player a lot of freedom to customize their UI, even lord of the rings online has a fully customizable UI (and that game came out in 2007)
2 - changing skill slots/character specific keybinds
it baffles me that the game even launch without these features, and it's downright absurd that at least one of them wasn't implemented over the past 10 years
3 - LFG not being instant-join
too many times have i had the experience of putting a group up looking for a healer, someone who wasn't a healer joining and refusing to switch character/build, then having to kick them and relist the group. in WoW, when a person tries to join your lfg, they only get added to the group if you accept their request, that way, if you're looking for a hunter and warrior tries to join you can simply not accept them or refuse their request, which spares you from wasting time kicking people and relisting the group.
bonus point for being able to see if the person requesting to join has already cleared the content. like putting a little checkmark next to their name.
4 - ability to inspect people's gear and build
this ties into the pains of pugs as well. how many times do people join as dps when they're wearing soldier gear and using random traits with all signets as their utilities. and asking every single person who joins to link every single item they're wearing as well as linking their build on chat is a ludicrous work-around that no one with an ounce of self-respect should put themselves through.