I'm pretty sure you've seen this already: http://adioso.com/blog/2013/06/responsifying-adioso/
I'm reviewing both currently to see what the differences in your approaches are.
I'm reviewing both currently to see what the differences in your approaches are.
I have to say that while your approach to responsive web applications makes sense, it is geared toward bigger web applications. The users of the application I'm currently building need to see everything on all platforms they use, the information just needs to be displayed in a different manner. The app is also small enough that loading something only to then hide it with a media query is not really an issue. It's obvious that building bigger apps you need to take conditional loading into account, but I'm not sure where the tipping point (in terms of app size) for that is. It's also true that the tipping point is moving as mobile internet speed and general performance increases.
I think what matters is that it is possible to be responsive/adaptive based on such contextual factors. Responsive web design is basically enabling that for screen size, but there are many more factors in play.
A tipping point based on the feature-richness/robustness of a programmatic solution to go responsive is another story (i.e. it shouldn't prevent from going in that direction).
Foundation makes building responsive websites pretty easy (with work :)).
We still use Foundation 3 because we have a couple of custom css libraries written as well, we will be upgrading to 4 soon.