That final solution was trash. Decouping can be helpful. For me the biggest is using third-party code. I can have my own URL structure for someone else's app and the views (in Django, aka controllers in Rails) don't change. Having to change every method just to fit into my site structure would be a nightmare. And I don't see a need to tie URLs to my methods, they're not always being called by a URL anyway.

Knowing about available parameters is again not a problem in Django, they are in the method definition. I was pretty sure this was the case with Rails anyway.

And as Chris already mentioned, you can have multiple routes if they are decoupled.