Simply put, the web and all it's related technologies move at a much more rapid pace than Java, C++, .NET etc.

We can complain about it all we want but if you drop out of this for a few years, good luck. I know tons of senior dev's who have no idea what modern tools to use. They don't understand modules, loaders, config files.

Trust me on this, the front-end guys like myself, hate the backend guys that come along and criticize everything they know nothing about. They also get in the way as they bumble and stumble over concepts UI guys already know. There is a huge distinction these days with backend and frontend web development. Each should avoid criticizing the other.