I'm still not really sold; obviously not good to be overly dogmatic, but MVC taught us the value in putting business (M) in a separate module to the view (V) an

I'm still not really sold; obviously not good to be overly dogmatic, but MVC taught us the value in putting business (M) in a separate module to the view (V) and hooking them up via a controller (C). Why does all this knowledge suddenly get throw out the window?