I think this is true, but I don't think it's the whole story.
What I see is that the best entrepreneurs understand that it's ok to leave 70% of the potential value on the table in order to have a business that's more explainable to investors and customers.
I think that's a particularly salient point for most intelligent/dedicated people to understand; if you're intelligent, you've got to remember that most people have a harder time understanding things than you, and if you're dedicated to your idea, you've got to remember that most people don't care about your idea as much as you do.
I would add that I think the Y Combinator application process forces you to leave most of the potential value of your idea on the table (assuming your idea has a moderate or high level of complexity). Since they're more interested in founders, this is probably a wise choice.
What I see is that the best entrepreneurs understand that it's ok to leave 70% of the potential value on the table in order to have a business that's more explainable to investors and customers.