I don't know about common sense.
What's odd is that he would use Linux as a metaphor, who but a hacker would get that?
What many people on HN consider common sense (e.g. Open ID, use complete sentences, use simple design for consumer sites) is not common sense to the general public (e.g. MOM, USE GMAIL INSTEAD OF HOTMAIL - CHRIST).
Gmail is not for moms I think.