This is smart advice, but by listing specifics I think a larger point is glazed over. For a business founder, struggling and hacking your way through a seemingly intractable technical issue is the critical formative experience. It's not about the tools - they're necessary to have the experience, but not sufficient. To me, it's about the intellectual approach of hacking. Marketing/product and technical development are both part-science and part-art, but technical development trains you to break down large problems into discretely approachable steps, while still keeping a wide view of the problem incase you find an improved fundamental approach.

Once a business founder has hacked his way from an idea to a polished version of something, he can be much better at his job.