Not him, but I would have stayed on 8.1 too if it weren't for processor support. The only annoying thing about it is the start menu, which i only use for maybe 10sec/month. It's faster than win7 and has a bunch of features I would miss, and compared to 10 it's not as bloated with non-win32 apps with less functionality for everything, tracking that you can turn off, and all the other win10 stuff you've heard already.

I am also on Win8 (some of the time) and those are the reasons.

What is the processor support issue?

Kaby lake and zen are only supported on win10.

I forgot to update to 10 during the free period and I don't feel like paying $100 since windows 8 still works fine.