Brave still maintains MV2 support (for now) so you get to use full-fat uBlock Origin. Eventually, I imagine they'll tire of it, say "well just use the built-in one", and get rid of MV2 when it gets too obnoxious to maintain.

I go through a 5 minute ritual every time I reimage/build a PC of installing Brave and disabling all the garbage on it. It's worth it to get Chromium compatibility and speed with uBlock Origin.