[mcintyre1994]

Honestly I'm not sure the Javascript story here is much worse - Babel tends to allow you to opt in to proposed specs pretty early, without worrying about browser support because you're not shipping it as is.

The benefit is that your polyfill/conversion to something browsers support today is handled by someone else, and your actual code base can point a reader to the proposal to at least make some sense later on.

Not that I imagine many people would encourage using a stage 0 proposal, but it's probably a bit better than everyone writing their own adhoc implementation.