Would you want a slasher to have plot armor?
If you signed up for a pretty stereotypical slasher horror game, and said slasher was relatively mundane, would you want them to have some form of plot armor?
By "relatively mundane" I mean they're basically just a big dude with a thick leather jacket and a meat cleaver. They might be strong or resilient, but not superhumanly so. Realistically, if they got shot with a handgun, they'd be seriously hurting. If they got shot again, they'd probably be dead on the ground.
By "plot armor" I mean either the game has rules for and/or the GM comes up with some kind of contrivance for how they escaped a trap, lived through seemingly lethal damage, or otherwise why a solid plan to kill/entrap them didn't work. The plot armor lasts until some unrelated, predefined moment. Like, for example, a certain number of people dying or a certain amount of real life time passing. They're free game after that! But any time before, and they can only be temporarily slowed or impeded. That whole sorta vibe, if not that specific implementation.
This is less a game design "should slashers have plot armor?" kinda question and more a preferential "what do you personally think of slashers with plot armor?" kinda question. I've seen this topic tangentially brought up a few times in the comments of a couple other posts, usually with respondents in various positions around the fence. So! I decided to make it an entire post.