Also, you can innovate using _loads_ of common sense, uncommon loads, to the point that something evident and simple, wasn't created before by anybody.

Also, I would like to point, that it's not the same "common sense" what a developer, who is some years in a university and techie environment, specialised on a few difficult technologies, than the "common sense" of a "final user" which does not care about technology quirks, code conventions, pre-existing tools, related news feeds, etc.