The author confuses short term efficiency with true desirability, I think - economically, too, not just in the "extreme efficiency is hell for us as people," sense.

What happens to your super-efficient workforce of people doing exactly one thing over and over when the industry shifts? It's very similar to code, here: highly optimized processes are hard to refactor.

The world is full of not-sufficiently-explored market spaces, hence the ability of small companies to disrupt large ones, and the growing desire to be agile and use MVPs even at large companies. Specializing to extremes is the opposite, and it will get you eaten in many, many businesses.