1. humans aren't produced in response to job market demand
2. even if they were, they have a huge time to market (at least a decade), which leads to feast/famine situations as supply/demand lags and fails to match demand/supply. You also see this other industries, eg. semiconductor manufacturing. It takes a lot of money and time to set up a fab, so they'll keep pumping out NAND/DRAM chips even when the market is drowning with it, just so they can recoup their investment.
2. even if they were, they have a huge time to market (at least a decade), which leads to feast/famine situations as supply/demand lags and fails to match demand/supply. You also see this other industries, eg. semiconductor manufacturing. It takes a lot of money and time to set up a fab, so they'll keep pumping out NAND/DRAM chips even when the market is drowning with it, just so they can recoup their investment.