PLD:
-Party buff of some sort
-Rez on a long cooldown

GNB:
-Meditate/Meditation-like ability for cartridge gain

DRK:
-Rework tbh
-Sustain to match the other tanks

General tank wishlist:
-New defensive ability
-Give all def abilities new vfx that persist for the duration or at least make them flashier when activated
-Sustain abilities/traits acquired at earlier levels

Could say a lot for every tank tbh but these would be some things I want most