I'm in the Warrens, in the last section before getting to the Nosferatu. I can't seem to find an answer to this elsewhere without seeing major plot elements, so I'll ask here: Are the Tzimisce enemies - particularly the two-legged things - going to still be a primary enemy type after I get to Chinatown? If so, I think I'm done with the game. I hate the laziness of jump scares and the fighting is less Thief and more Dynaasty Warriors: Silent Hill.

Well, generally speaking, starting with the warrens the game gets more combat oriented and less RPG. But there won't be many Tzimisce creatures after the warrens. Iirc only one if you play vanilla or the base patch, a few more (two or three) if you have installed the plus patch.
I won't ell you more here because you don't want spoilers.

They're pretty much exclusive to the sewers, they're only in there in the first place because the Tzimisce wants to flush out the Nosferatu and prevent them from aiding the Camarilla.

Yeah those freaky creatures that have their anus uncomfortably close to their mouth don't really appear that much after the warrens, which IMO is the crappiest part of the game, bar none.

While it's true the game becomes more combat-oriented as it goes on, IMO the combat is generally both less annoying and/or avoidable. Human/vamp enemies can sometimes be stealth killed too (though it's probably not worth it at that stage of the game).

There are some intense and possibly annoying combat encounters in Chinatown - but they're much shorter and (more importantly) much less boring than those ass-mouth creatures.

IMO the warrens is the main reason I always play the Plus Patch these days, since that allows one to skip most of it. Makes repeated play throughs much better.