Did the author try to use the components from a low end phone? Generally it looks good but all the jumping, flashing and crashing do not signal version 1.0.0.
Totally. 64% of my users are on mobile. Can one really afford to ignore that crowd?
Of course, mobile web development is, as I tend to say, the IE6 of modern days. So many older devices, and we also need to more or less support all of them.
Graceful degradation is the key, yes, but React-MD doesn't even seem to cope well with high-end devices.