And what they then lack is a young and growing populous, which are who all the previously mentioned benefits should be for. Nothing is perfect.
https://cis.org/Report/Fertility-Among-Immigrants-and-Native...
Japan has started to encourage immigration, but probably too little, too late.
Almost every country in Asia has a declining birth rate.
https://www.statista.com/statistics/1171367/apac-total-ferti...