Except for then you have to deal with whatever version of embedded Internet Explorer .NET uses. Maybe the UWP solution uses Edge now, but that still isn’t wonderful compared with embedding Chromium.
In contrast, UWP applications do use the Edge rendering engine, and while it may or may not be possible to use CEF in these applications, you won't be able to get it certified by Microsoft, therefore no one, at least to my research, has bothered doing so.
I wonder what the future brings with Edge now just being chromium based