I think your point comes down to whether or not you believe we’re all blank slates. If yes, then what you says makes sense. If no, then we would expect ability to somewhat dictate socioeconomic status.
The question in a school context, though, is whether socioeconomic status for children determines ability.
As I stated in my original list, what I observed was that gifted classes were filled with children from high social status backgrounds. They certainly didn’t create the conditions for their socioeconomic status, their inherited it.
But it begs the question, do you believe that racial disparities are primarily due to social factors or genetic ones? Because the whole point of equity is that advocates are arguing that it’s due to social factors, and that we should seek to change that.
Why should a child suffer simply because they were born into a less supportive family environment?
I don't know. I'm no expert and definitely don't have the answers.