Ava's missing the catgirl branch, a maid branch ending, a nympho branch ending, and a futa branch ending, and Dakota's missing every variable/branch ending besides the pornstar and bitch endings. Dakota might have a third? I can't recall, it's been a hot minute since I've done her endings. Regardless, most of her branches and side event chains are unfinished.
Event-wise it's harder to categorize because it's the vast majority of them.
Westane pruned or stunted every single route and event chain in the game that wasn't already finished before he started his focused updates to finish off each character, and he dramatically downsized the scope of the game and, to my knowledge, hasn't done any of the announced planned content nor intends to at this point.