What if the engineer's goal is to have the biggest possible impact on the world?
You can work for a big company that serves billions of people, claiming that you are making an impact on the world, while in reality doing nothing.
On the other hand you can start your own company, perhaps only directly impacting a few hundred people, and still accomplish the goal of maximizing your change on the world (as that was your ceiling).
What I'm saying is that, if you believe Parker's argument, it isn't necessarily against an engineer's best interests.
EDIT> Limiting the discussion to tech, if you want to have the biggest possible impact, you should be working on AI or IA.