Although I do believe Javascript is a mess, I'd have to disagree with that. The problem with Javascript and to an extent all client side code is that people uses as a everything tool not neccesarily the language being at fault. People should start to realize handling logic on the backend is perfectly fine and is often better as you don't need to send several megabytes just to load a simple web page. If we decided to replace Javascript with Python we just recreate the same problem that plagues the modern web.