The "save some money" bracket was not intended. If you can do that, great, it will give you flexibility. But the real value is in learning deeply about non-trivial problems.

And, yes, I am saying the best preparation for worthy entrepreneurship is to do something else. Using the method outlined by the blogpost, the only problems you can solve are the problems that you encounter in your everyday life. If, however, you go (for example) to nursing school, you will learn about [a] a much larger population of problems, and [b] a population of problems that are, in many cases, grievous.

We all get one crack at life. Solving silly problems is one way to spend it. Solving real problems is another.