The text input spelling checker is really terrible; late 80s spell checks were better.

Forgot which, but had a 12 letter word that I misspelled one letter of, Brave underlined it in red with no replacements in right-click menu, I fixed it by googling the spelling and underline went away.

In often happens that it has no or even very wrong suggestions.

Personally, I don’t like the inability to turn off the update mechanism, which is annoying on my macos 10.13 computer that has a warning bar every time I run the brave browser application. I suppose this means there is telemetry built in that can’t be removed

The UI, mostly. But the point isn't that I'm not in love with Brave. The point is that I use it because it's the least bad option, and I wish there were an option that I would actively like.