It sounds interesting, and surely there would be some awesome things that would come from it, but on the other hand, MS could use this to take control of linux APIs through their "embrace, extend, extinguish" strategy, so it would not be without risk.

Just look at what happened last week with linux distros needing to update their secure boot keys with a new MS signed certificate. https://www.redhat.com/en/blog/expiration-secure-boot-signin...

And look at what MS did with their old version of Office for Mac, where they decided not to simply renew a certificate that would keep the software functioning. https://www.windowscentral.com/microsoft/microsoft-office/yo...

We already have companies like Nvidia and Broadcom shipping binary blobs to support common hardware. Do we really want a corporation like MS getting in on that kind of thing? If MS wrote some really great desktop linux software, it would be hard for the broader linux community to resist being lured into using MS controlled APIs, and handing over part of their control to Linux's most notable rival.