Browser Account isolation (with seperate browsers)

Depends. If your threat model is protection against anything Google then it’s a great tool.

Any unhardened Chromium browser, including Brave, leaks browser metadata through noisy APIs like Client Hints. Google have a strong controlling interest in Chromium design.

You can disable Client Hints but every other Chromium fork (apart from Cromite) doesn’t do that leaving you easily fingerprint-able.

That said, there’s some benefit to mixing browser profiles like Brave & Firefox for different activities. From both a technical and an opsec point of view.

Also, not making official binaries available for Windows & Mac is not a strong point from the project. But the source code remains available to anyone on those platforms who wants to compile it.