I had loads of non-UI issues with 8, 8.1 and even more with 10. For example suspend was completely broken on a Surface Pro on 10, while on my desktop it would mess up the filesystem on a drive every few days. They fixed most of them eventually but it took a long while. I’ll prolly upgrade somewhere just to get the free license (I assume there’s gonna be a cutoff date again) and then go back to 10 right after