Something needs to change. I don't care about one specific proposal.

It's miserable having a de-facto build step for an interpreted language. Worst of both worlds.

Maybe just TS is fast, but it encourages developers to put more and more stuff into that build step (and they do, they do that a lot). Culturally, that trend is not going to change unless the main reason for having said build step is removed.

The whole babel/transpiling thing was meant to be temporary. It became temporarily permanent / permanently temporary.