Comment by taviso

I think the new features in MV3 are great, and UBO lite is great. The initial versions of UBOl worked, but definitely lost some power user features. Those are basically all back, it now has full scriptlet support, custom dynamic filters work, element zapper is back and you can now have custom dnr rules. That's a very powerful feature that doesn't exist in UBO.

The big loss for me with the mv2 deprecation was uMatrix, so I made my own replacement. It's a prototype, but you can try it if you like: https://github.com/taviso/matrix3

I think the real question is how have Edge and Mozilla shipped WebExtension support on Android, but Google hasn't. If other competent vendors can ship it then there can't be a technical reason, it must be a policy decision. I'm more open to hearing conspiracy theories about that than MV3 :)