It seems to me that this is not a honest attempt by gorhill to actually adapt uBO to V3. Rather he wants to ridicule it.

Adguard is working on an actual replacement of their Ad-Blocker that comes as close as possible to the V2-version:

https://chromewebstore.google.com/detail/adguard-adblocker-m...

I can understand his frustration. uBO will lose what makes it special, the ability to serve as a wide-spectrum content blocker. He wants to make a statement.