The Windows PC industry has historically been, and still is, much more dependent on 3rd party software than the Apple ecosystem. So performance will not be good

The Windows PC industry has historically been, and still is, much more dependent on 3rd party software than the Apple ecosystem. So performance will not be good without porting 3rd party software to ARM. It's similar problem to how Chromebooks have still not really displaced Windows laptops except at the very low end of the market. Although the significance of this seems lower now than at any time I can remember as more happens in a browser than ever. Windows 10 apparently is fully ARM compatible with a built-in x86 emulation layer, so perhaps it could work.