Sheesh fellas, lighten up, he has some interesting things to say. He's not laying out the 10 web commandments, just some opinions about software design. And his thoughts have some merit. It is distinctly hard to build large applications with a language as dynamic as javascript. At least in python and ruby you have classes. In javascript all you can do is duck type. Also javascripts scope is great for being the worlds most flexable language but not for building large web apps or hiring devs for that matter.

JS is a great and flexible language that runs on more devices than practically any other language. But it is hard to write large web apps in it.