Agreed. I see zero chance that Edge will suddenly be ported back to Windows 7. And it would be almost as big of a shock if the Chromium-based Edge is not UWP.
https://www.theverge.com/2018/12/6/18128648/microsoft-edge-c...
That may be so, but is there anyone outside of MS who believes in UWP? Not even stalwart MS exclusive devs seem to do so.
The fact is that if they want to support Windows 7, 8.1 and macOS it naturally cannot be kept as UWP app, as their infrastructure requires Windows 10 features.
Mainstream support for Win7 ended in 2015, for Win8.1 in January 2018. The only mainstream supported versions of Windows are various Windows 10 editions.
(1) https://support.microsoft.com/en-us/help/14085/microsoft-bus...