Windows 11 is as much as new version as 7 was, which was a glorified Vista SP3 with a new UI (and yet is considered to be the best version of Windows ever by many). Every consumer version of Windows since the DOS to NT switchover has just built on the previous one. Some changes bigger than others (like the switch from XDDM to WDDM), but you only need to open the Device Manager, for example, to be presented with something that hasn't changed in a couple of decades. Hell, dig deep enough and there's still stuff dating back to Windows 3.1 hiding away.
Windows is a mess under the hood, and it's never going to change unless there's a clean break with (native) Win32 support.