I agree for the most part. Collapsable dropdowns and jQuery drag-and-drop are nice-to-haves, but I also clearly remember the hellscape of state management in js/jQuery and I'm not to keen on going back to that.
To this day I don't understand people saying this. Can you describe a project or instance where it was tough? I never had any issues even in complicated projects with thousands of lines of JS.
Developers didn't understand event delegation, so entire codebases were filled with $.live, on and off events. If you componentized behaviors with jQuery it wasn't all that bad, although I'll admit it could get somewhat gnarly.
The problem, from what I saw was nested forms and trying to hold state on the client when the server should have been asked for the state. This lead to template duplication and trying to hold too much state on the client.
