[ilyt]

If you try to save on workforce cost by.... making materials more expensive, that only works if materials are not the big part of the cost. But they are for housing, usually by far the biggest cost.

If it is just "mold plastic differently so it can be put together quickly" and doesn't add much cost, it is worth it, but if you prefab walls cost more than raw materials + labour to build something similar... and on top of that are less elastic (just certain width and height etc.).