With respect, if you cannot tell the two types of writing apart with certainty, then your analysis is akin to superstition.
Speaking for myself (as ever), I am just not bothered by what bothers you. Good writing is good writing. Bad writing is bad writing. Who or what generated it, and how much time it took, is immaterial.
I'm glad all the assumptions about other people got walked back, I hope the openness about my personal situation re: AI was concrete proof why everyone identifying AI writing is not a panicking person afraid of it and starting a new religion against it. :) Cheers.