To add to this list

5. Remove WebView apps. Eat our own dogfood and use MAUI.
6. Go back to the classic Start Menu. Use API to make the whole UI available for customizations
7. Get rid of the whole shitty "Settings" menu and go back to the Control Panel.
8. Drop backwards compatibility for a bunch of crap. Stop pulling the 1980s forward, let that shit die.
9. Address real modern issues with compatibility and performance with current CPUs
10. Undo all the vibe coding.
11. Focus on stability and performance, not trying to be "An experience". Windows runs apps, make it do that the best it can.
12. For the love of everything holy, take a risk and modernize the OS. This goes back to 8. But as someone who makes Windows Server golden images for multiple platforms, FUCKING CHRIST. Having to use the Autounattend to even get anything started, and that's often (Even in Azure) just a minimal thing to get some client to do the real work, should tell you there's a problem. The Autounattend is poorly documented. I learned more from just building a basic VM on different providers and seeing what they figured out. I could write a god damn novel on the shortcomings of the initial installation and customization of Windows, but it's especially embarrassing for their Server platform
13. Stop dropping support for the crap that works. Just so you can sell an inferior subscription version. WSUS being sunset is stupid. Having on-prem WSUS is always going to be faster and easier. You should focus on making that better instead of letting it limp along and then "Oh, we have an overpriced and slower option!" Get bent.
14. Azure Local is a really fucking cool idea. That was an god awful pricing as far as I can tell. But neat.

Please dont do step 4. Devs will get heart attacks left and right if they see that piece of shit code.

GLP2 at least and reproducible builds or bust.

They can't open source their code because then people would rather rapidly discover all the backdoors they've built in for various US LE and Intelligence agencies.