I'm not much of a Windows user, but MSIX sounds great.

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.