> It's not long until Brave won't be able to support Manifest V2

That's true but not that big of a deal in their case. The built-in ad blocker works quite well and removes the need to run uBlock Origin.

Brave's adblocker won't do anything against Google's trackers if Google builds it in to the engine.

Again, I advise against trusting anything Chromium-based.

Also, you apparently haven't heard of uBlock Origin's Medium Mode. Brave can't even touch that. There's more than just advertising to worry about on the web.