Execution over idea (or, I thought it would get easier by now)

There's a notion in the tech startup world that execution is more important than ideas. I happen to agree with that because anyone can have an idea, but what separates the successful companies from the unsuccessful ones often lie in their ability to execute on the idea. Can the engineers build the product in a timely manner? Can the salespeople sell the product? Can the operations group fulfill delivery of the product once customers buy it?

The same notion holds true with writing. Story ideas...