Right, at a start-up the value of product, sales, and marketing is huge compared to that of engineering. Most engineers can create an MVP that will deliver the promises of the other 3.

The problem is trying to scale that product once marketing and sales do their job. I think the value of each of these 4 changes depending on the company size and tend to normalize to 1 as the company scales to the size of Google, Amazon, FB, etc.