Bring back skill point allocation! Or at least something that allows us to change and/or improve our skills as we level up without taking a feat.
Maybe at level 5 or 6, each class should be able to get expertise in one of a few possible class skills. Then at level 13-15 you can get another expertise. E.g., wizards might get Arcana, Investigation, and Sleight of Hand (repeated casting of spells improves hand dexterity) as possible options.
And fyi neither feats that give expertise -
Skill Expert and
Prodigy - are in the PHB, so likely won't be implemented in BG3.