I haven't really found anything that hasn't worked in Windows 10...at least I haven't had an issue with any of my gear. SGP is also developed on Windows 10.
I agree it's a little annoying...but at the same time (as a developer) I can completely see how they just want to support a single operating system. Having 3 operating systems to support must be very costly. Probably cheaper to anger a few people and potentially even lose some customers rather than support all 3 options.
At least on one of my machines I was prompted quite often to upgrade until I finally did. But I also knew it was eventually going to be forced and I wanted to be able to control that.
Jared