My PC was W10 compliant, though W7 was installed. It had 8 GB; I added another 8. My gadget indicated RAM use, etc., which was not excessive with 7. 10, & the task manger indicates >80% RAM usage.
Why did they move things around or hide things?
Where are my screensaver controls?
If Microsoft made cars, they would have moved the steering wheel to the trunk!

I have a wireless keyboard; W7 used different sounds when switching to caps lock and from caps lock. 10 uses the same sound for both. Oh, there is no caps lock light on my keyboard. There is a very brief on-screen indicator, but that requires looking at the screen. When I type, I look at the keyboard.
I 'upgraded' to 10 about 2 weeks ago, & so far, am regretting it.