Getting a PhD to Become and Expert

Some people decide to go into a PhD program because they think that they can become an expert in a particular field. Yes, you will become an expert. But not the kind of expert you think. Most likely, you will become an expert in something nobody outside academia cares about.

For example, if you get a PhD in management, most likely you will become an expert in a set of esoteric psychology theories.

I even heard from IT people that they don't hire Computer Science PhD's because they usually have expertise in areas that don't have any practical applications yet lack skills in essential areas of programming.