I disagree with your position.
“But have you ever been to Disney when it’s raining? When you’re sick? When there’s an annoying kid on line behind you? Not exactly the ideal experience, right? No matter how painstakingly Mr. Q and Disney worked to make the park the most enjoyable experience possible, there’s nothing they can do about certain aspects of a customer’s experience. They can design all they want (quite successfully mind you) for an experience, but never fully designing the experience itself.”
Of course a designer can improve on all that. It just has to be made a priority, you have become intimate with the customer problem and then let your imagination run riot.
Solve the problem better, not just improve the solution.