new 27.5s in the M range just seem a lot bigger now.
Yup
Embrace it… will feel odd for the first ride or two, but pretty soon you won’t want to go back! I was messing about on a cistomer’s XL sized bike earlier, and seat height aside (I got away with dropping the dropper just enough to have a play on, but a 20″ seat tube would mean I couldn’t even run a 100mm dropper on it!) the bike felt fine to me… at 5ft10!
Don’t worry, I’m not Chris Porter. But be prepared to forget what you thought you knew about bike sizing and embrace the new normal. You’ll find once you’re used to it that it makes a lot more sense!