> JS has had more time and effort spent in hardening it

JS required the time and effort because it's a clown-car nightmare of a design from top to bottom. How many person-hours and CPU cycles were spent on papering over and fixing things that never should have existed in the first place?

This doesn't even count as a sunk cost fallacy, because the cost is still being paid by everyone who can't even get upgraded to the current "better" version of everything.

The sooner JavaScript falls out of favor the better.