I think the problem is that the web as we know it was not fundamentally designed to be seamless. We decry it now, but it was the reason that Flash took off in

I think the problem is that the web as we know it was not fundamentally designed to be seamless. We decry it now, but it was the reason that Flash took off in the first place: you could just make your app in Flash, and all you needed to know otherwise was just enough of a template to load the plugin content. Compare that to today, where the browser is an amalgam of at least three different languages (more if you're using something like this), and I struggle to understand how 'seamless' is likely to be possible.