At least in Windows 7, you can simulate XP with XP Mode. but that won’t work with 10. (And BTW, what happened to 8 and 9?)
Windows 8 was just a horrible mistake. It was a good NT operating system "under the hood", but the new smartphone-inspired user interface ("Metro") was beyond the pale on a desktop. It was denounced and rejected almost universally.
Windows 8.1 addressed a few of the most egregious flaws in Win8, but didn't begin to fix the overall problem.
Windows 9 never happened. They went directly from 8.1 to 10.
There is precedent for this. When Windows NT first came out, it was version 3.1 to match the then-current MSDOS-based Windows 3.1. There was never a Windows NT 1 or Windows NT 2.
MSDOS-based Windows:
8 and 9 are somewhere out there with Vista.