I ran your proposed changes by TC39 and their initial reaction was simply "no".

Is Bun the new IE6, then?

To be clear, that was my opinion as a delegate, not the consensus of the committee, as that hasn't been formally discussed. That said, I believe other delegates share my opinion that shared memory concurrency needs to come with more constraints than what is suggested here, and while some delegates might be fine with it, I doubt any unconstrained shared memory concurrency would ever reach consensus if brought forward as a proposal. Currenntly the language spec is actually unclear on whether this is allowed for a compliant engine, and something we might want to update.

I have respect for past you, whose accomplishments are incredible. Current you I think of like a circus performer. I trust you to get ooohs and aaahs from the AI-race spectators who don't know any better. I don't want someone who is primarily in showbiz within 10 fucking miles of my infrastructure though