Heraldic rules should apply to flags, insofar as it is centuries of graphic design knowledge about what can be distinguished from a distance, and in low-light.

Heraldic rules should apply to flags, insofar as it is centuries of graphic design knowledge about what can be distinguished from a distance, and in low-light. Politics aside, the white-blue-white flag is simply a better design than the current flag of the Russian Federation, because color on metal is easier to distinguish. But the French tricolor looks great, because it follows the rules.