It's not like the USA needs a butt-load of "math PhD's".
It's not like the USA needs a butt-load of "math PhD's".
It is a recipe for innovation. Most of those people want to do things with their knowledge, not teach classes. Most go to business who use that knowledge to innovate and increase profit.
Businesses literally get an excess of highly educated workers for (almost) free, and for some reason the MBA/Tech-right class thinks its a good thing to blow up that system. Absolutely bonkers.
https://philip.greenspun.com/careers/
Scroll down to the graph under "Not So Very Serious Stuff".
Innovation is hard, most ideas do not pan out, and most people aren't made for it. It really is a number's game: to stay competitive and innovative as a country you need enough people pushing against the frontier, including taking bets that are too risky for the private sector.
It's unsustainable. I got my PhD 20 years ago, but I would certainly advise my children to avoid it.