What you're telling me is that instead of considering how a house is going to be built and where the plumbing and wiring for said house is going to be as a whole, you're considering it completely separately. This is nonsense. You're going to have to wind up tearing down parts of the house to add in the toilet that should have been planned for in hand with the house design. This is an awful way to design. For someone who can decide a level is bad because of the layers used, you seem to have some awful methods of designing the way the thing is played.

They are two different things but they make up a complete stand-alone whole. You don't eat a burger and go "This lettuce was lacking the proper taste and the tomatoes weren't juicy enough for me. Also the cheese was in the wrong location, it should be right under the pickles NOT under the ketchup. 3" and then go "Also, this bun was good so the bun rating gets a 7.5" You go "That was tasty burger." and go into detail on how tasty it was, describing everything under a "tasty burger" catagory. Before you mention Eyecandy and how it too makes up a part of a whole, in this analogy its the wrapper and establishment you got the burger from. A clean establishment and well designed wrapper may make you enjoy your burger more, but they don't have any bearing on the burger's taste. The bun, meat and toppings do. The burger is level design. Having a seperate rating for a bun and the contents of the burger is just unnecessary splitting up.