You seem to be resisting the client/server arguments. One reason you might want to pay attention to them is reusability. If you ever decide to let others use your app, I doubt that you want their browser windows from showing up on your desktop (if you're hosting the app) or an unattended server (otherwise).

Sure, you can get the behavior you want, but you're going to a good bit of trouble to avoid doing things in the conventional fashion.

...roboticus