Of all the compile-to-languages, the one that strikes me as having the least merit is JSX. It's basically a ton of added complexity for the sake of what boils down to syntax. There are no real gains in terms of language semantics in JSX.

The react community has become a big cargo cult. There are some good ideas in the community and many Bad Ideas™. Paving the bad idea cowpaths lends a sense of legitimacy to these bad technical ideas that is not merited.