Same question here. Is this the honest reality nowadays, that only one frontend library/framework became "the standard"? It looks to me, that React is "the winner" and most of us should focus on this, because others just come and goes... Is that true?

People were saying that about jquery too. Vue is gaining a lot of traction too. This year it is STILL react being the one with biggest userbase, but that might not be true in a year or two. This discussion pops out every once in a while, IMO there is no "we should focus just on this" in IT world, landscape is ever changing.

Well, how do you propose this sort of framework work with them since it needs its own Javascript? At which point it can offer a better experience by at least tying in to one framework (like letting you drive a component's state with props).