A short list of things that have killed my desire to do specific things i thought would be fun character or party concepts or frustrated me when playing something. I omit things i assume are known bugs or which are confirmed to be different in the future.

-Lack of rogue expertise
-Lack of ritual spells
-Ability for wizards to learn things they shouldnt be able to from scrolls (cantrips, non wizard spells)
-Abjurer hitpoint shield being temporary hitpoints instead of its own thing
-Shadowhearts stats
-Lack of drow crossbow proficiency
-Lack of good cantrips for arcane trickster (i realize they are not phb based but perhaps some exception here to make the class more viable? As thief has been buffed)
-The popup spell menu of hex gets really old fast
-Hotbar clutter from different leveled spells
-How bad some save based spells are relative to hit based given the games height system throwing everything out of wack.