> For as long as we’re able (and assuming the cooperation of the extension authors), Brave will continue to support some privacy-relevant MV2 extensions—specifically AdGuard, NoScript, uBlock Origin, and uMatrix

Once Google removes MV2 and it's supporting code, Brave is not going to shoulder the cost of keeping all of that patched to run on newer builds of Chromium. Especially not because their own blocking doesn't rely on it, uMatrix has been deprecated since 2021, and AdGuard is already committed to transitioning to MV3.