Windows 10 isn't popular. It's just that windows 11 is crap in comparison. Release an OS that isn't predicated on what's good for ad revenue and Microsoft's bottom line and everyone will upgrade.
Well, it's popular not because of demand but because Win7 is ancient. In the old times there were utilities that copied win2k binaries into a winNT4 install to add features like new directX, I wonder if that is still possible on win7
It's pretty annoying in 10 too. I had a big scratch folder on my desktop and one day it decided to start syncing with one drive after a restart and one of those setup/welcome like screens.