It is an evolution of desktop bridge, appx and msi.
Does it add a simple context menu entry to convert an installer? Bonus points for straight up Install and even more for Run.
I see it's open source, so if it's missing it may be possible to make a distribution of it with those things implemented. Then one could install it and make it a default msi handler.
Edit: from what I see conversion is much more involved. Create a certificate and go through a wizard and fill out some forms. Correct me if the is a quick and easy convert option. Otherwise it's a nice thing that needs more development to be useful for a generic user.
https://blogs.msdn.microsoft.com/sgern/2018/06/18/a-closer-l...
A generic user is supposed to just double click on an *.msix file to get it installed on the Windows Store infrastructure.
This sounds like someone making installer stuff would say. MSI will be supported on modern OSes for much longer than "a few more years".
VB6 apps created in 1998 will be supported until 2025 at least. MSIs will be treated the same.