The grid is not responsive, for I have not enough time, ha...
However, I think it is wired that when grid is responsive but nearly all other components is not responsive. It is not a good idea to put all responsibility to ui-framework for building a responsive layout.
Developers always say that no silver bullet. I agree with it. So far as I know, nothing can make you write code once without handling any corner case of the whole compilicate user interface. I don't always try to find a perfect way to solving a problem: If **thing is complicate itself** (after your carefully thinking), accepting it (and start to solving it case by case) would always be a nice way.