Humans like talking to humans.
Humans especially like talking to humans in authority. If you're going to have to play by a rule, it's good to know that the rule is real, and not an imaginary rule made up by a fifth-level bureaucrat on a whim, or because they're looking for a bribe, or because they don't understand the company policy, or because you're small fry and only big players get to break all the rules.
And humans like consistency, closure, and clear boundaries. The hardest thing is not necessarily abiding by the rules: It's trying to avoid abiding by rules that aren't really there. The easiest way to ensure that you're pushing the envelope appropriately is to press yourself right up against the edge, and the best edges to push against are the ones that are firm, so that you don't keep having to second-guess yourself, or waking up to discover that your competition is getting away with more than you are because of some uncontrollable factor.