Pull too hard in a loop exit in a Yak 52 and be even a tiny bit out of balance and BANG, you flick.
I see your point, true, the butt isn't a precision AOA instrument or even a stall indicator. Listen to your butt tell you your AOA is high, or low, but don't ask it for exact science.
Wing loading decides how much precision you can achieve flying with your bum. A Cub bobbing along like a cork is much better than the big bad Yak slicing through the air.
No time for any info from your bum, and there isn't any anyway.
Yeah there is! You're in a loop, you're under G. Your squashed butt says your AOA is high, right there. About unexpected flicks: see butt sensitivity and aircraft design, above.