@nprofile1q... We've always said that we'll support MV2 extensions as long as it's feasible for us to do so. Reverse engineering MV2 support after Chromium removes all relevant code is, unfortunately, something we don't have the resources to do.
As for the built-in Tracker and Ad Blocker, you could look into enabling/adding additional blocker lists.
Also, we are constantly working on improving the built in Tracker Blocker, so with time it will get better and better.