Earlier quoted context omitted.
> We produce more PhDs than needed by either academia or industry. I don't think so - industry can't hire enough PhDs. In my field (programming languages) shortage of qualified people is a bit of a problem at the moment! We wish there were more being produced.
Most Ph.D.s are unemployable in the field that they did Ph.D. in. There is only say very small pool Ph.D. topics which are needed in industry like ML, distributed system, pharmacy etc. Most of the Ph.D. is in fields like humanities, psycology, physics etc. doesn't have many openings in industry.
Like I get the schooling you do prior is supposed to allow you to hyperfocus something, but at the same time, I've seen jobs asking for postdocs with experience in highly niche areas, often cross disciplinary. One I saw was looking for someone with encyclopedic knowledge of some crazy domain specific algorithm at the intersection of two sciences.
Wild guess, but I if I were to bet, I'd bet most people with a PhD or even professional experience in the filed would not have heard of this algorithm.
I guess I've seen similar software jobs, but at least with software I can usually afford the equipment to learn things myself.