Speaking solely for myself, I don't do well with changes. It took me decades to manage to use a mouse with a computer and on my laptop, I don't have to; thank GOD. You do NOT want to hear the horror stories about how and what I messed up when attempting to use a mouse.
I knows/understand how to do everything I do do on my laptop and IF that process were to change, I'd be lost.
I didn't even want to go from 6 to 8,so when I got a new laptop, I got a refurbished old one, that has 7. Ergo, if having Windows 8 was going to throw me, what the bleeding hell do I need the damnedable 10 for ?
My wife is totally non-tech, she went from 98SE to XP to 7 to 10 without missing a beat. She uses the same programs she’s always used, except she is using the Edge browser, which is way better than IE (though it doesn’t support extensions yet, however, she didn’t use any so that didn’t matter).