Certainly not! And I hope I haven't given insult. If so, it was entirely unintentional on my part, and I apologize for my carelessness in so doing. I'll put more thought into my words next time.

Don't get me wrong - I don't mean to say that all of Stephenson can be encompassed in those two words. Were that the case, he wouldn't have had to spend time writing books. I mean only that, if you're looking for a handy way to convey a primacy of idea over character in what an author chooses to explore, "high concept" is an adjectival phrase commonly understood to carry that meaning. Might save you some time, is all. (And, on the Internet of 2016, a dictionary is never far away...)