A grill on a cart is reached in minutes. The same grill dropped into a stone island is held on three sides by something a mason built, and the order in which anything can come out was decided then rather than by the manufacturer. On this badge that is the usual case rather than the exception.
It is why we ask for a photograph of the island before an appointment on anything built in, and why the access is quoted as its own line rather than folded into a part price and discovered mid-visit.