Most advanced economies are experiencing internal ZPG. Many are unused to lots of foreigners coming in. Many are relatively overpopulated. It would also dilute local culture and for small countries it would certainly overwhelm the local culture. On the other hand they need to remain a “going culture”, i.e. not dying out.

Korea’s pop nosedive should not be seen as the antidote for badly planned demographics elsewhere.

Sure, if they want to that’s okay but they certainly aren’t obliged to.

Let’s imagine what would happen to Bhutan if they opened their doors to their neighbors.