I pretty much agree with you.
BUT
Australia does it your way and it is being inundated by legal immigrant Chinese and Indians with educations. If I were Aussie I would not want my country to become a Hindu-Chinese colony. They have massive numbers of Chinese students in their universities and they all want to remain.
May be Australia has less immigrants on welfare, and fewer crimes committed by immigrants (legal & illegal). My wife used to work at a larger medical practice in California as billing manager, and in her observation half the patients were on MediCal and many coulod not speak English.
NZ requires immigrants to pass English proficiency test. US requires no English, no education, no wealth from chain immigrants.
As for Indians and Chinese taking over Australian immigration, fully 1/3 of world’s population is either Chinese or Indian. And they push education in those countries. Expect more of them all over.