He argues it well for fundamental things, but I think it falls short because he doesn't touch on abstract notions, like 'personal freedom', 'federalism', or 'separation of church and state'. There's a line that can be re-drawn between what is "language" and are "ideas", and the Sapir-Whorf hypothesis holds depending on where you draw that line.

A lot of our thought is based on frameworks of metaphors, the vast majority of which are learned, not discovered on our own.