The one class per action pattern helps with async calls and callbacks. The handler class has methods for each HTTP method plus the callbacks it needs.
That would get really messy in a controller-with-multiple-actions pattern as the controller classe now has a lot more methods in a single class: all the HTTP methods it handles plus the callbacks for all of them.
i dont agree with you, i would rather have a controller with multiple actions, rather then "controller"/requestHandler per action, because in most cases you want the controller to handle all the actions of a page, rather then one action.
Having controller per one action would put overhead on the code lines you write.
