I am not sure where you got that from. Windows runs great on ARM. I got one the Windows Dev Kit 2023 (it's an 8 core ARM PC with 32 GB of RAM, 512 GB SSD). I ran run Windows, Office, Visual Studio, GIT, etc.
I suspect a lot of games will not run but everything else works fine. This includes x64 (x86 64-bit software).
Also, MS has made a lot of their software ARM compatible. Office 365, Visual Studio, and Visual Studio code all have native ARM binaries. In Visual Studio's case, it has fewer features than the x64 version (mostly fewer supported SDKs).
Overall, I can't tell I am even running on an ARM system because it feels like an x64 system. It is responsive, fast and just works.
Microsoft has a history of trying to use architecture transitions as an excuse to lock down the platform. But when both of the architectures are still available, that puts the newer architecture at a competitive disadvantage.
However the Windows developer community couldn't care less if it doesn't bring more money home, and Microsoft isn't Apple, backwards compatibility matters.
