Nothing, because who wants to be working with legacy UEM and VDI apps from 1990s?
The Same people who want to still work on Cr-ppy Windows and Windows Apps, plenty of financial institutes and associated call centers that deals with loads of sensitive information that they what to keep it as secure and isolated as possible. you can keep developing apps, and call them native apps, modern apps and cloud native, yet your need an end user to use that app from a the same old, legacy, windows OS.
Those are the people we sell the products to..