Yes, but in startups, being a PM is often very hard, because no one has to listen to you. So you need to bring your own credibility and influence so the product gets done properly.
Oh, definitely. Sorry, I sounded like I was criticizing the post. I really just want to make the case that PM is not a fluffy role. "Architect", "CTO", "advocate", "community manager", "evangelist", "information design" --- all carry fluffy connotations. PM owns nuts-and-bolts stuff that companies need to be doing, no matter who's doing them.
It's hard, and "fluffy" at the same time :-)