> I meant that if we “turn a blind eye” on dark matter in GR, then no universal formula can cover it. In the same sense that universal jet aerodynamics formulas

> I meant that if we “turn a blind eye” on dark matter in GR, then no universal formula can cover it. In the same sense that universal jet aerodynamics formulas don’t account for trees and mountains. I'm still not sure what you mean here. The "universal formula" in GR is the Einstein Field Equation, which covers everything (more precisely, everything in which quantum effects are negligible).