I can't tell you how many PhD's I know the resemble your remarks. Quite a few of them (most?) are not doing anything related to their field of study. For example, one with a PhD in Physics owns a small vocational school teaching nursing and some IT courses.
The following is going to sound horrible. Over the years, having worked with thousands of people over a career spanning about five decades and across a range of disciplines, I developed this strong belief that if you need to get things done you should not hire PhD's.
In fact, speaking of technology, some of the most creative and talented people I have worked with were university dropouts who, for the most part, got tired of the slow pace and wasted efforts (i.e., having a year of general education coursework for an EE or CS degree) and went off on their own. I am talking about people who had a direct hand in delivering millions of dollars of revenue for the companies who employed them and doing so at breakneck speed. The going joke at one place where I used to work was something like: If you need it done right and in 6 to 12 months, get a college dropout with enough schooling to be able to do the job. If you have four years and don't are about making a prouct, hire a PhD.
I know, harsh. I did warn it would be.
That said, I have met many brilliant PhD's. I just don't know how the skills, capabilities, creativity and productivity metrics distribute in that population. No clue at all.