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I don't disagree with any of your points. React is faster. React has a larger community. All of it, I agree.

But. When it comes to productivity (actually building something and maintaining it), I can achieve way more in Ember.

I'm only guessing that's because you have prior experience with Ember and are only starting to use react now.

I find code written in ReasonML is 100x more maintainable than anything written in javascript, whether it's react or ember