I don't buy your premise: I'm pretty sure the number of JS-disabling users has dropped significantly and we're getting to a point where it's acceptable to requi

I don't buy your premise: I'm pretty sure the number of JS-disabling users has dropped significantly and we're getting to a point where it's acceptable to require JS. Server-Side rendering is implemented to satisfy search engines (and even that's changing) or to speed up the first page load. Your second point is a tautology. Of course it's impossible to run JS code on the server if you don't want to run JS code and the server and don't want to rewrite it in another language. FWIW, both ES5/6 as well as coffeescript vastly improve 'callback hell'