Given the David & Goliath nature I'd be bending over backwards to avoid situations where I get that kind of pushback, but I may be so utterly out of touch with the reality of how it "has to" be (and then I'm very optimistic that it could still be better).

Maybe this could've been deprioritized until succeeding on other features and learning each other more through that process, then coming to the table with an excellent first draft Mozilla only has polish to add (not fundamental disagreements).

I can list dozens of unilateral Google projects that are pushed under the guise of "standardization" and then released despite no consensus or against explicit objections from other browser vendors.

And this feature? It's literally pushed by Google unilaterally.