>>50131830
That's more of a tengu and their oppressive caste system and hierarchy thing. Part of it could be argued to be due to them building their entire society around poorly imitating humans, but I'm pretty sure that Aya would still be in a dead-end position even if the tengu were still kidnapping children and eating them regularly.
>>50131839
Nah, Mizuchi was retarded. We didn't even get a real reason why she wanted to prevent the more peaceful Gensokyo from happening, even though as a shrine maiden or assistant, she'd have more than enough to do in just regular shrine business.
Youkai not being able to cope with life in post-barrier Gensokyo because it goes entirely against their nature is a far more interesting concept to explore than some dumb brat who couldn't get a man because of the tobacco stink and threw a hissy fit in response.