I think it's because computers develop too quickly to have it. Some of the other things you mention such as building materials have been around for years, even centuries, and are the way they are going to be. I think if someone developed a bright new way of creating aluminum ingots for instance, that the aluminum industry would be thrown into chaos because some of the "old way of doing it" wouldn't fit, just in the way the computer industry is now. When the computer industry settles down and quits developing so quickly then it will have a certain accepted way of doing things too. Of course then it won't be nearly as interesting, and I for one, if I'm still around by that point, will have to find something else to tinker with.
