Pure JS obviously has its uses but I am assuming every professional values productivity which one can't often obtain just by knowing JS itself. JS sometimes feels like assembly, you just don't want to touch it, that's why things like TypeScript exist, for example.
Also, saying an abstraction is useless without knowing the language is similar to saying you can't drive a car without knowing how the timing belt or crankshaft works - most people do fine without either. I'm not dismissing the value of JS fluency, just suggesting that it might be unnecessary and a more practical approach can be taken.
Also, saying an abstraction is useless without knowing the language is similar to saying you can't drive a car without knowing how the timing belt or crankshaft works - most people do fine without either. I'm not dismissing the value of JS fluency, just suggesting that it might be unnecessary and a more practical approach can be taken.