A specification is great, and I'm happy to see that. However, even though it's true that transpilers can compile JSX with arbitrary semantics, it still requires

A specification is great, and I'm happy to see that. However, even though it's true that transpilers can compile JSX with arbitrary semantics, it still requires writing your own transpiler. JSX is a great syntax, and these changes mean nothing if you're a transpiler writer. What I was hoping for was the JSX transpiler that React uses would become flexible enough for any library to use, without the need to modify/rewrite the transpiler itself. Yes it's possible for someone else to write something like this, but writing a compiler is no small feat =/