If we were to use the wall analogy, I'd put it this way: the customer should care about the structural integrity of the wall, how much load-bearing weight it ca

If we were to use the wall analogy, I'd put it this way: the customer should care about the structural integrity of the wall, how much load-bearing weight it can carry, or whether extensions can be added easily to it etc. So while getting "the damn thing up" may be the burning expectation in everyone who isn't making the wall, the wall maker knows the consequences of poor work and it is his responsibility to educate folks who depend on said wall.