If I am reading this correctl, I think what youre saying is that because there are walls made of wood glass etc.... there is no point to make the enclosure more natural looking. Why would you argue this point of view? Natural enclosures are of a huge benefit for the animals psyche. Not only does it help the animal feel more secure with natural shelters, but it also helps stimulate the animals mentally. All at the same time making the enclosure more appealing, to the owner and the animal. I am a huge advocate of keeping them natural, after all its the least we can do since we have them in walls of glass or wood rather than vast areas of natural habitat.