Why do you think this is an attempt at a persuasion tactic? Taint flags in this context just means something that might be relevant to debugging. Which this condition might be, if people in the future are unfamiliar with a potentially anachronistic split between /usr/bin and /usr/sbin. The debug message isn't there to judge the morality of your configuration. It's actively improving your ability to continue to support both ways, by properly indicating what style of system it is for troubleshooting purposes.