Windows 11: Just say no
It will be one thing, say, later this year or in 2022, to buy a new PC with Windows 11. We can be reasonably certain that Windows 11 will run on your new Dell, HP, or Lenovo PC. Maybe some of your drivers and programs won't run, but Windows 11 itself? No problem.
But, if you want to update your existing computers, especially those that have a few years on them — that’s another story. It's difficult to know whether any given computer will run Windows 11, which arrives Oct. 5. Yes, there's Microsoft's PC Health Check app and other programs to determine whether you can run Windows 11. But Microsoft pulled it the first time around and I'm none too sure how reliable it is this time around.