It did seem in the past that there was much more of an all-hands-on-deck attitude towards education throughout US corporate activities, more broadly focused on the general fields the various companies valued the most. I suspect this fall off is very real, but don't actually know if that is just my impression or if there is a concrete effect from modern economic structures.

It's an important enough question it should definitely be studied and taken into account in policy.

However I can't agree with your conclusion that "Immigration helps the countries [sic] top-line metrics, but it rarely helps the citizens inside the country". That requires meta studies that I have never seen to prove it is so. I could cautiously accept that "some types of immigration rarely help corresponding sections of the local population" much more than such a blanket judgement. Overall, it is just not true that economics is zero sum. It doesn't have to be. An entire people can in fact flourish.