I have arguments with people about this fairly often. Common sense is learned, not common.
I think what happens is that if you get lucky, and learn a mental model for the underlying system that better explains the process you're following, it becomes indistinguishable from "reality" and appears "common sense". If you get really really lucky, someone teaches you (or you spot it), really young.
That's why things like this PDF are so important. It applies especially to areas in which we may not have learned "common sense" (like typography, or even basic Usability).
One of the seminal books in my canon is "The Simplicity Shift,"[0] by Scott Jenson[1] (who used to run Google's Mobile UX team).
He wrote that in the era before smartphones, and it was all about brutally triaging UX priorities for a limited mobile user interface.
I think what happens is that if you get lucky, and learn a mental model for the underlying system that better explains the process you're following, it becomes indistinguishable from "reality" and appears "common sense". If you get really really lucky, someone teaches you (or you spot it), really young.