I think browsers need to implement options to block most of the bad behaviors you describe, and bundle it all up into a "this site is an app" permission that is

I think browsers need to implement options to block most of the bad behaviors you describe, and bundle it all up into a "this site is an app" permission that is off by default. Pages that are fundamentally just documents dressed up with fancy navigation features don't need all those anti-features and it's the browser's duty to spare the user the annoyance, but Google Docs does need most of those APIs.