PLD: give them back access to CNJ spells (yes I know Cure was pretty useless post 50 or so, but for low level content it was invaluable). As it is Clemency is gained so late that for most of their career now a GLA/PLD is basically now reliant entirely on external healing or popping potions for solo content, so returning the ability to equip CNJ spells would make things so much better (look how many newer players are complaining how ridiculously difficult the level 30 GLA class quest now is because it was designed with the fact GLAs were able to equip Cure to heal in mind originally for instance).

WHM: bring back Stoneskin! Maybe give it a buff that increases it's potency the higher your level is (like, 'Stoneskin II' or something).