They are a little more even handed though. I think one of the examples are specialised scalpels. They point out that a doctor innovating a new surgery may need a tool which simply doesn't exist, and theyll need to build it themselves.
On the other hand, a professional scalpel maker may know about a new alloy, or a new casting technique, or a way to mass produce them for pennies. You get the best product when both types of innovation are present.