Requiring proficiency in the language is reasonable, but requiring everyone to be richer than the average member of the population and have enough money banked to live off of for 30 years seems insane. That goes well beyond simply making sure that people are able to care for themselves.
They don't want to risk someone coming for a job, getting fired and becoming a drain on the social safety net. Able to care for themselves not just now, but for a while. It's a reasonable position.
That's not how good risk analysis works. You also have to consider the alternative that you exclude someone coming for a job they excel at while becoming a net benefit to society just because they couldn't support themselves in an eventuality that didn't come to pass.
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