I've got an older system by today's standards that still runs the game well by my standards.
I have been running Windows 11 for awhile now. No issues at all. That being said.... I do not see any reason to upgrade to 11 if you don't want to or can't. There is just nothing in 11 that is impressive enough to worry about an upgrade. Windows 10 will be supported for quite some time. Relax and have fun.
The only real benefit, if you can call it that, is vendors knowing your browsing habits, what you say and do in private moments, and generally giving away all privacy. Microsoft really is Big Brother, but to fair so is Apple, Facebook, Twitter . . .