First, immigration is currently calibrated FAR in excess of any demographic gaps. The population is growing rapidly. If the premise were to plug demographic holes, we wouldn’t need nearly this many people.

Second, if the premise were to alleviate demographic issues at the young end of the pyramid, then immigration policies would block any applications for those over 30, or at least heavily bias the young. They don’t.

There is exactly one reason immigration has been calibrated so high, and with such little care for the skills and qualities of the applicants: to suppress wages and working conditions. It’s the same playbook all over the West.