It’s precisely in the gray areas where a political/economic philosophy needs to be most robust. Otherwise it will prove inadequate to handle everyday life. It’s in the border cases that all the conflicts arise. If our philosophy can’t give strong guidance and best practice on how to resolve such conflicts while preserving the NAP, but instead must appeal to common practice and belief, then it has little practical value as a political philosophy.
“No battle plan survives contact with the enemy.” When your plan meets the real world, the real world wins.