You mean the platform that specifically disallows competing browser engines, making Firefox just a shell over a Safari-enabled web view and that can't even access Safari's content blockers? The only Firefox that's not running a Firefox engine under the hood? That Firefox?
Given you're a developer for Brave, it's not possible for you to not know this, therefore your statement is misleading at best.
The pitfalls of Chromium are obvious... it gives Google the power to impose on the market whatever engine feature they want, they are the ones defining the web standards and there's nothing Brave can do about it because Brave does not have the capacity to maintain a full fork, or to fight for web standards, just like it doesn't have the capacity to build a browser without piggybacking on somebody else.
Don't get me wrong, nowadays even Microsoft admitted total defeat, but then Brave should recognize its total dependence on Google and its continued goodwill.