if anything, flatpaks are THE official (universal) packaging format for Linux
I don’t deny that, I make good use of a ton of flatpaks on my system. I also believe that it’s the best we have. And I would literally switch to Brave as a flatpak if it would satisfy the following:
Be official and thus maintained by Brave itself.
Not having to forego its own more powerful sandbox due to (hopefully) current restrictions of Flatpak. Yes, you read that correctly; while flatpaks are arguably the safest way to consume most applications, this doesn’t apply to apps that actually have stronger sandboxes which had to be ‘slimmed down’ when packaged as a flatpak. Thus, currently, for maximum protection, one simply can’t rely on flatpaks for their Chromium-based browsers. If you choose to do so and it has worked out for you wonderfully; that’s awesome, I’ve been there and enjoyed the experience as well. But, I can’t justify it for myself any longer.