It is good to not leave people waiting.
Joe is getting ready to go out with friends.
Joe wants to look good tonight.
Joe decides he's going to wear an outfit he always gets complimented on and is quickly on his way.
Joe takes way too long to choose how he's going to dress and ends up being quite late to meet his friends.
Joe is not late and him and his friends are quickly seated at a great table.
His friends wait for an hour at the restaurant and lose their reservation.