I agree, and it takes force to break them out of this behavior. I know of a guy, who forced the contractors to break down the wall they just built because they didn't let him inspect the place behind the wall before enclosing it, as promised in the contract. He knew that if he lets this slide, they'll keep doing it.

An analogy here would be forcing the agency designers to completely delete any speculative redesign work, without any backups, to force them to focus on the logo, and send a strong signal that I don't care about the redesign, and won't be paying that work.