So, not sure about anyone else but I consider it a major downgrade to have to install a third-party codec pack that contains who-knows-what in it just to keep using BigBox with videos. Is that actually going to be necessary? Also I'm sure this is nothing new to the team but what about this: https://github.com/videolan/libvlcsharp. It does say it supports wpf forms but I know all of nothing of programming and I'm sure it's more complicated than a simple google search, so feel free to ignore me.
EDIT: I just went back to 13.20 and confirmed that for me VLC is working perfectly fine with no performance issues, so the perceived disturbance of a perfectly working system is pretty annoying IMO.