Your basic disagreement here feels like it would be obviated by the parents "I hope this makes its way into the ECMAscript spec"? I.e., you would get typing without any of the tooling Typescript requires; the parent's point was JS + typing would be a pure benefit compared to Typescript, and you've said nothing to disagree with that.

So while you technically are disagreeing with the parent, it's on the smallest of points, and completely disregarding the main one the parent offered (which, fair enough, but wanted to point that out)