I've thought a lot about this "Great Team v. Great idea" and I think what you're saying is partially true. You have great teams failing right this very second, and it's viewed as ok given that they are, well, great teams. But that still leaves them failing.

I think a major problem is that neither the biz nor the tech co-founders are the lynch pin, it's the correct combo of both + an amazing idea + that 'never give up' determination + timing.

I think there are a lot of people getting full of themselves, be it devs, biz people, or VCs. I think it would do us all well to realize that yes, we DO need each other.