Ya but what I do is use it for the entry lvl items and its great because when you first start out you can put up a residence over them. By time I have a 1k pop I have to have multiple buildings so I just build the upgradable ones when I need joists etc. I like that I make steel tools w/o upgrade as well. The houses have totally changed how I lay out the city. Its much more akin to that old Civ Rome game I put the houses in rows strategically around vendors at the bottom spread out and don't even build a market. Did you mod those yourself?