I think the flaw in the argument is the author's generalization of anedoctal evidence as if everyone was the same. Medical schools is not pointless. Getting a degree because many employers require it (as opposed to being stuck in customer service roles) is not pointless.

There are many ways that people can make the most out of their degree, and many ways to waste it as well.

It's very easy to dismiss something as being useless, but ironically, entrepreneurship is about doing the exact opposite: finding and exploring value where others see it.