On top of that, when we immigrants also compare against other developed countries, we see how immigrant friendly the US is. The natural born citizens wouldn’t necessarily care about that
To the contrary, plenty do care about it in the sense of being opposed to further immigration from developing countries. "Demographic anxiety" is a term often used to describe this.
Also, both natural born citizens of recent immigrant ancestry and those natural born for many generations care because anti-immigrant sentiment is a canary for a broader xenophobic trends.
When pressed, almost everyone has an opinion on immigration policy.