While I would love a UWP version of Chromium Edge as well, I would imagine that we won't see one since UWP doesn't run on Windows Server or Windows Terminal Services. Microsoft and corporate customers need a browser for those versions. Their only options currently are IE 11, Chrome and Firefox.
However, along similar lines, I'm wondering if/when Chromium Edge will be available through the Microsoft Store since this is the only way to get it to run on devices running Windows 10 in S Mode such as Surface Laptop and Surface Go. @hez2010
I support your opinion. I think that if the new Microsoft Edge is excellent enough, it can replace IE11 before long. UWP and traditional win32 versions of Edge can coexist like those of IE on Windows 8, if both of them can provide good user experience. Third-party browsers based on Chromium made by Chinese companies usually run slowly even on some entry-level laptops because they have too many unnecessary functions and some of them have annoying ads. In the meantime, Chrome can't sync in China for some reasons, and it still can't scroll smoothly on my devices. UWP version of Edge is important for low-end devices like Surface Go and other tablets.