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So the company that invented it does not know how to properly use it?

Or are you implying that React does not fit FB use case?

He's literally saying the front end technology doesn't matter at all in this.

Are you just going to defend React to the bitter end? Or do you just enjoy imaginary binary choices?

I think I was not clear in my question:

I don't defend React. My question was almost the opposite and I was trying to ask:

So if even Facebook has a problem with using React then who has a better examplea about why and how to use it?

Like I said, React has nothing to do with the slowness issues of messenger.com.