“Because I said so” ends a conversation. “Here’s why” starts an education.

Authority can produce compliance and it cannot produce understanding, and those two behave very differently once you leave the room. Giving the reason costs a minute and hands the other person something they can use next time. It also invites them to find the flaw in it, which is uncomfortable and usually valuable. Refusing to explain protects you and teaches nothing.

When you ask someone younger or newer to do something, give the reasoning without being asked. Then be willing to hear that your reasoning is thin. You end up with a better rule, and they learn how the decision got made.