What QOL features from EU4 have you noted are missing in EU5?
For my part, during a Byantium game: there's no way to indicate to an ally which territories you want to claim/occupy.
Nor is there a way to persuade the AI to give you occupation of a province.
Meaning, if an ally in a war occupies a piece of territory you want, there is literally no way for you to get it from them besides cheesing.