Is it a garage that has the same hygiene standards and medical equipment as an office? Your metaphor kinda falls apart here, because those are not orthogonal to the medical service outcomes, the way that a menu is orthogonal to the food quality.
>No, it's entirely rational to judge a service based on external signals.
This is the crux of why we disagree: you think of a restaurant as a seller of a service and you count things like "menu" as part of that service. Thats fine if you want status signaling from your restaurant. I see a restaurant as a purveyor of a good: the food that is produced, and the menu is orthogonal to that. You and I are optimizing for different things.
"Experience" versus food.