Not really the same thing though is it. Windows is platform for rich client apps, a browser is the platform for a web app. The interface between me and the platform is strictly defined and controlled and that's how I communicate with it. More to the point (about shipping code) I don't ship Windows with my rich client apps and I don't ship a browser with my web apps.
So what are you saying? Google will keep the scripts updated in line with browser updates that break compatibility with older browser versions? That would actually be useful, though not breaking compatibility would be more useful. I'm still going to have to retest and potentially reship my app. I'd just do that with the latest library scripts.