Backback displayed above shop is thing that need to be back, coin to switch betwin for e.g mounts and pets, old look of player panel, now to check how much time you have left on potions or mount you have to switch betwin different charts, previously that was more use full.

When you have multi acc and you are switching account where you end quest you ware taken straight to fight after entering that account, now you have to click on tavern to end quest, minor stuff but for me it was making game more convenient.

Previous guild panel also was more convenient then new one. Many thing now require more clicking and if you are not menaging many acc that not the case but still many players find out menu thtat require less clicking faster and handy. Main reason for that is we got use to it over the years