That's a great point. There is a third branch in the trifecta, which is advertising/PR to tell people about what you have. Be wary of someone great at advertis

That's a great point. There is a third branch in the trifecta, which is advertising/PR to tell people about what you have. Be wary of someone great at advertising/PR but not at market fit. Those are two distinct questions. Often the founder needs to "own" market fit, probably with the help of others, and advertising/PR can be somewhat delegated. However since market fit drives every decision, it can be hard for that person to be anyone else but the founder.