Just an innocent question , does it really need to be in the spec ? I mean typed arrays make sense, but isn't that too low level ? Things like that, just like a

Just an innocent question , does it really need to be in the spec ? I mean typed arrays make sense, but isn't that too low level ? Things like that, just like async or even promises concern me. Javascript, the language, shouldn't be concerned with async programming at its core. What I mean is, a js environment that support threads directly, doesn't need promises or async stuffs. Isn't putting memory management or concurrency into the spec limiting JS environments to a certain model of memory management or conccurency model ? there is no notion of event loop up until ES6 in the spec.