I mean you're pretty spot on but... every character feels pretty shallow. Even Cait, the girl with the most content and dev favoritism, is extremely shallow and surface level. Same goes for mostly everybody else, really. Brint's a friendly bro, Azzy is just a really sweet girl, Etheryn is just Cinderella, Quin is just... Quin(who fucking cares), 'Tui is sort of a nerdy tomboy, and I've already gone over Berwyn and Arona.
Eh, most characters have multiple things going on. They might be archetypes, sure, but they are introduced and function as characters outside of sex.
Ryn is a princess/queen, your relationship with her is related to her confidence and how you can help her do that. She has ties to several other characters, a purpose, goals, a quest to hunt down her sister, etc. She feels like a fully fleshed out character.
Azzy is presented as a knight trying to defend her home. Atugia is Carmen's bodyguard, and has some kind of weird hidden history for the way she is. Even Arona is struggling with her people's lifestyle and how to lead them. Jumping outside of companions, just picking random people...Ragnild, the blacksmith in orc village, is mainly defined by how she is different and less savage than the other orcs.
The teacher in KM is...well, a teacher, and her main motivation is mainly her kids, with a bunch of scenes revolving around them and a chunk of her dialogue talking about them and her stats as such. Aileh is initially presented as wanting to observe you because of her mother's interest.
But with Wsan characters, for instance - the dryads? The main one you interact with's whole job is a "seed-bearer", she's defined completely by the fact that she has a dick, and most of her interactions immediately after you meet concern you introducing her to blowjobs. Evelyn is literally presented with her dick in someone's mouth, and you sub to her immediately after that. The centaurs in KM are prostitutes, and their quest to rehome them basically ends with them having more sex as a job. The new(ish) horse futa in KM revolves around having a harem, and you joining it. Heck, back in TiTs, Amber simply ran around the forest with a massive boner asking people to have sex with them.
Most of his characters are built completely around their fetish, and their main motivation and method of interaction is sex. If you notice, uncontrollable lust is a recurring element with his characters, he really likes that one (especially when paired with horse futas.) A lot of them are literally introduced having sex.
Mind you, this isn't a condemnation of Wsan or anything. I've said many times that him and William are probably my favorite writers. I'm just observing that he's not really good at everything, necessarily. He
is really good at focusing around what he is good at, though, and what's he good at is the main goal for a lot of people playing this game, of course (really steamy sex scenes).
I just think that all the writers have their own strengths, and most of them can do some things better than Wsan.
...except maybe Bubbles. Not sure what he's good at.