Here's one I totally understand why it became a thing, but.
Like, how everyone in science fiction always references the *exact* things the audiences likes. In order to make this sound as ridiculous as possible, imagine if someone in a Sci-Fi set in 2700 said, "This is just like that one episode of Interview With Monster Girls."
You'd whiplash so hard your head would fall off and then you'd be a Duhallan, and that's no way to get ahead, @Private Lee O'Malley.![]()
A cliche-I-can't-stand (or I can, but...) on Interview with Monster Girls, and a few other non-human manga I've seen- when they boil down the 'monster' attributes far enough that they're more 'humans with a quirk'.
The Duhallan and the Succubus are the only two of the Demis that have real major issues. Granted in the vampire's case that's due to the presence of being able to have blood bags, and her story isn't about dealing with any major problem, but drinking blood is about the only stand-out things to vamps in that world, they don't have much bloodlust, nor powers, nor that much in weaknesses.... the Yuki-Onna really doesn't have much other than a chill.
My Pathetic Vampire is another example, though it may be intending to play with the trope a bit I still feel it applies. Vampires that can go indefinitely without drinking blood and etc.. Though at least they're unaging.
They're still often cute or fun series, but I find that having the attributes so weak really waters things down, to the point where it really comes across 'here's a cute normal human with a metaphor for being slightly odd socially,' in comparison to Monster Musume or My Girlfriend is a T-rex or Nurse Hitomi's Monster Infirmary that really give inhuman attributes to their characters and run with them.
People are afraid of Rachnera because she's a giant spider with pointy bits! The girls in Hitomi's class has problem with growing too fast because she's actually growing to beyond-human size! People are intimidated by Churio because she is a T-rex girl who growls at people! (If vaguely human size, she is still bigger than you and has claws and teeth!)