I understand where you're coming from, but you're basically talking about interpreter support here - not the language. This would be like me taking the old Bor

I understand where you're coming from, but you're basically talking about interpreter support here - not the language. This would be like me taking the old Borland 4.0 C++ compiler and then telling you that C++ is SO slow to change. It hasn't moved since 1994! Which is wrong. The language spec has clearly updated. ECMAScript is not defined by browser support, even if you should be taking browser support into consideration before choosing tooling. Just because you're not choosing to use new language features doesn't mean they don't exist.