So what you're saying is that we're actually using Win3.1 For Workgroups SP[VERYBIGNUMBER]
No. There's truly substantial differences under the hood.
Windows 9x was all NT 4.x
Win2k and XP were NT 5.x
Vista/7 was NT 6.x
I'm not being completely fair, 8/8.1 is technically NT6.x with a different shell. 10 is a different NT and a lot of under the hood mods. 10 is what 8 should have been, and it's clear as hell. Instead of spending the time polishing up what's now currently Win10, they shoved Win8 out the door. 8.1 was a panic ridden bugfix to Win8. Win10 was rushed when 8.1 also went over like a lead balloon with corporations.
Win10 is getting mixed reviews in the corporate world. I'm advising it's a miss unless they sort things out. Again, FOR THE CORPORATE WORLD. It's probably good enough for consumers. Unless they pull another XP SP2 out of their forth point of contact, Win10 is a wash and we'll wait for Win11. Win10 isn't bad, but it's not great either unless you're massively into HyperV. Server 2016 is the same boat. It's already a wash unless you're a HyperV shop. Then it's a blessing.
Also on the plus side, Windows is finally moving heavily over to command prompt, which will make life much better.