I think the point is that the decisions on direction shouldn't be made behind entirely closed doors by insiders. Outside input should be taken seriously, with invitation to dialogue, rather than chasing some narrowly-supported vision.

As a web developer myself, I too am baffled by the folks who don't like the Web stack, but fine.

And good points, I guess I wasn't too concrete on "unify on one approach" vs. "consider all options". So to solidify my thoughts, I do think diversity in approaches is a good thing. It would just be great if any parts could be shared so that others could iterate on the same idea.

For an example of a missed opportunity for diversity, if only React Native had originally architected itself as Reactless Native + React, we could've had equivalents for each different renderer by now (e.g. Vue Native, Angular Native) based on that Reactless Native base.

For an example of the merits of unifying on one approach, see Yoga Layout. Flexbox has proven to be an agreeable layout model, and because it's so solid (apart from where it varies from the spec, which I do grumble about) various different cross-platform projects have benefitted from unifying around it as a reliable building block.

I guess my grumbles with Yoga's spec deviations echo your distaste for the "it's a solved problem" sentiment, too. Even established solutions should be open to improvement and evolution, and I had that partially in mind when talking about being open-minded.