My take on this:
While this is a great new feature for WIN32 developers (ie. Powerbasic apps), it also tells us something about Microsofts attitude towards WIN32 support.
They would not add a feature like this to the Microsoft (Windows) Store if they desired to terminate WIN32 support any time soon. Maybe this is a good indicator of what to expect in Windows 12. As would be very surprised to see Microsoft do this and then remove all WIN32 support from Windows 12.
This seems (to me) to indicate that Microsoft wants to continue to support WIN32 apps in the future, but simply wants to make the use of WIN32 apps safer for end users, by controlling now only the install process, but also the update process.
This is good news in my opinion.
