My current understanding is that our economy is based upon continual growth. The generation of today can afford more things because there will be additional people in the future to pay for it (say like getting a larger return on investment for money, a return that’s above the level of inflation)I have no issue with immigration, however I do with population growth and the economic lie that it is needed.
Personally, I suspect that in the ”near” future the need for zero population growth and zero economic growth will be an aim for societies.