Microsoft’s decided that they want to make changes. If what you want to do is vent about it, then you can vent about it, but it isn’t gonna change that. Nobody here is going to change Microsoft’s policy on the matter.

You’ve already looked at changing OSes, decided that you don’t want to do that. Okay, fine.

You’ve decided not to disregard security updates and compatibility with new software. So you are gonna have to upgrade at some point.

So then your options are to suck it up, which it doesn’t sound like you’re happy with, or to try to figure out what UI you can keep consistent across releases. I’m just suggesting that given what you’ve said, I’d probably consider doing the latter if I were you.