According to who? You? One of the countries you specifically just listed has just tamped down on some immigration efforts [1].
[1] https://www.beehive.govt.nz/release/government-responds-unsu...
It's very interesting how NET migration figures are rarely mentioned when this happens. Yes migrants are entering NZ in record numbers but citizens and migrants alike are also leaving in record numbers. (not uncommonly for the exact reasons I mentioned - the NZ economy is not competitive and it's not a place educated, ambitious, career minded people can maximize their potential)
Still waiting for your citation about how to measure a populations "ambitions" and how that factors into economics. Maybe work on the source citing, and a bit less on the personal attacks.