NFL rosters are made up of many black players who grew up extremely poor. How can football success be dependent on high socioeconomic status yet the vast majority of great players don't fit that mold. Where are those players in Iowa? Serious question.
Being an individual player that has enough talent to progress as a player is a completely different thing than having 11 guys on the field execute.
You can have talent and athletes, but if those kids aren't at practice consistently and don't or can't do offseason stuff, your team is going to suck. It doesn't matter what kind of athletes you have.
A guy I knew was a coach at one of the DMPS schools years ago. Getting kids out was hard in itself, and having kids consistently show up to school and practice was a challenge. a bunch had to watch younger siblings because they had no child care while a parent (often the only parent in the house) had to work. Or kids would quit to get jobs.
So of course the team isn't good, which discourages kids from going out, and the cycle continues.
People can talk about "building culture" and it's hard but can be done. I don't think so. When you have a majority of your students living in poverty and all that comes with that, there's nothing a coach is going to do to be able to consistently compete at least at the 4-5A level.
Not to mention, now a lot of the best athletes in these schools open enroll because it's easy to do.