I'm not sure what the point is of drawing any of these metaphors - a market is important because you want to make something useful, and execution is important b

I'm not sure what the point is of drawing any of these metaphors - a market is important because you want to make something useful, and execution is important because you want to beat your competition. If you don't have a market, you lose in the start, if you don't have proper execution, you lose to competition. So do both. So ideas without execution are worthless. And good execution of a market-less idea is also worthless.