Being open-source wouldn't fix things like that.
It'll be just like Gnome: PRs that fix UI gaffes wouldn't be accepted because "The Developers Know Better!"
You thought open-source means there'd be no design and they'd only jam code, while designing and architecturing is only for proprietary projects within ivy towered castles?
If you're willing to ignore Imaginary Property laws, there are some very interesting chimeric OSes out there on the shadier parts of the Internet.
Did you have something else in mind? Email is in my profile in case you have a link that you can share.
Some multiplayer games with kernel rootkit/anticheat might not work, but I haven't encountered any Linux-specific issues in the games I play. I'm sure this isn't the experience for everyone but it's worth a try.
https://www.theverge.com/2024/8/14/24220138/microsoft-bitloc...
And the FAT filesystem driver: https://github.com/microsoft/Windows-driver-samples/tree/mai...
And also PowerShell: https://github.com/PowerShell/PowerShell
And most of .NET: https://github.com/dotnet
Maybe they could consider an Apple-style approach: open source the core of the kernel and text-mode user space but leave the GUI closed.
Of course, open sourcing everything would be even better, but that might too big of a step for them. Open sourcing the non-GUI core could be a good initial step, whether or not it ends up going further.
Calculator (the horrible UWP one, unfortunately): https://github.com/microsoft/calculator
As for that FAT driver, it was traditional to include in the SDK/DDK sources of some of the actual drivers in Windows, so that one is not a surprise.
I think that is what could happen in 10-20 year period. As long as they could drive enough revenue from Cloud.
At least M$ under Nadella so far has a much better strategic play than most other tech CEO.