Comment by pjmlp

They tried with the PS/2 MCA architecture, but naturally everyone ignored them.

Nowadays Microsoft could easily do it, they aren't fully into it, because they managed to botch themselves the whole WinRT/UWP and Windows 10X transition, had they made it in a way that most Windows developers would join the party, and the outcome would look much different.

Windows 11 sandboxing already requires MSIX and store distribution to be fully enabled, they only have to slowly keep turning the knobs on Windows 12 in whatever form it shows up, eventually.