How does this happen? How do you build a fundamental OS control in react?
Not only has Project Reunion been a disaster (moving UWP regular Win32), apparently Microsoft new employees lack Windows experience, being raised in Chromebooks and Macs, apparently they aren't getting the trainings they should.
You can go watch recordings of the community calls, and see puzzled faces when asked about Windows capabilities not yet supported on WinUI/WinAppSDK.