There have been news since February.
UWP hosted apps got replaced with PWAs, including access to UWP APIs if signed, documentation and tooling support is now available.
https://developer.microsoft.com/en-us/windows/pwa
https://docs.microsoft.com/en-us/microsoft-edge/progressive-...
This is what made me have another look at PWAs, start experimenting with them and starting to see, that for plain CRUD applications PWAs are probably the way to go.