Here's another one: a person's perception of whether they "are" rural is actually a better predictor of their health outcomes than whether they actually are rural. I.e. two neighbors living side by side in suburban America, the one who perceives themselves to be rural will have dramatically worse outcomes than the one who perceives themselves to be urban/suburban.
These are both potentially useful things to know as we try to eliminate extreme health disparities between Americans.
You seem to think we have all the answers though, so what's the answer? How do we do it?
FWIW, the specific cited research where she's trying to quantify the health impacts of living near pollution sources is actually important for e.g. lawsuits where people try to hold corporations accountable for poisoning their children. Any value in that?