the Liquid Glass for example probably is not so great when it comes to resources. Probably works better with latest metal and hardware blocks on the GPU in M5 as opposed to using GPU cores and unified memory on 8gb M1 making latest macOS work not so great. I have the M1 8gb air and it is really slow on Tahoe. It was snappy just a couple of years ago on a fresh install.
Not upgrading any of my Macs ever again. I was a fanboy looking for every new update like a present, for 13 years, not anymore. It took one Tahoe burn all that trust. Never upgrading major OS versions on hardware from Apple again.
I've been holding out as you do for as long as I can but in 1-2 years the apps just stop working (some of them).
Win 11 is bad compared to Win 10 as well. I'm fairly new to Linux so I can't really form an opinion there.