Agreed. But the product is defined by the business talent, and not the programmers. If I give Linus Torvalds a job to make me Facebook for cats, he will deliver FB for cats. But I cant then turn around and say that Linus failed delivering the product. No. It was me, the guy in charge of the product.

Usually the founders are the business talents (regardless of profession) (or I'd hope so)

And that's the issue. Most "founders" are just people with an idea and not a fucking clue on how to sell something. Then they go and hire programmers, spend their ass out on stupid shit, and blame everyone but their own stupid self. The role of a "founder" is to get the fuck out of the way and try to be as useful as possible to those he/she hires to build a product. Nothing else. Founders are more like evangelists than anything.