I had an interesting experience with W10 yesterday. I've been using W10 since before it was released so I (thought I) know it pretty well.
A neighbour was having trouble downloading videos from his camera and uploading to Facebook. I said I'd help. The W10 I know is an upgrade from W7. I use W10 pretty much the way I used W7 with all the same applications. The neighbour's PC obviously had W10 factory-installed and he was using the full app experience. Turns out I didn't know how to do anything, even getting from one app to another.
After 30 minutes learning curve, I was able to get the videos out of the camera but I just wasn't able to figure out how to upload to FB using their app. Turns out the app doesn't have an "upload video function" like the website - you have to have the video in folder "camera roll" and share it to FB.
I'm going to have to requalify my comments about W10 - I like W10(7)!