No, keeping up with new web standards, security, etc. is a full time job. It’s not something volunteers can keep up with. At that point, it may be better to just give up and build on top of Chromium.
In addition, without enough market share, websites will not test, let alone optimize for your browser. This is already causing issues for Firefox. Smaller browser engines stand no chance.
I mean, most websites will not respect the ban, so people will use those.