I disagree since a few years ago. Before i was a developer, or better said, a hacker. I wanted to solve problems. Right now, I more or less know hot to solve problems, so develop a product is kind of boring. From time to time something new comes, but is not usual.

Problem => Analyze => Solve (if makes sense to solve the problem).

After years, that is kind of repetitive.

So move up one level is thinking on products, and hacking in a more social level. Learn about usuability, psychology... how the people behave and what the people want. That are things that we the developers should know to be... Better developers.

Hacking is about understanding. Understand how the things in live work. Understanding why a product A success, and a product B fails.

So I will say that founders should be hackers.