OpSecJunkrat I'm not an expert, but I believe the Tor Browser's anti-fingerprinting features are superior to other options (including Brave). So having a browser that has that same anti-fingerprinting capabilities without the Tor network could have some use cases. (e.g. faster speed, wanting to avoid malicious exit nodes, etc)
However, as you mentioned, the drawback is worse security since it's based on Mozilla Firefox. So certainly not a foolproof solution.