There are reasons other than zoning affecting supply. Regulations exist for a reason. While some of those reasons are of debatable merit, some are good. You

There are reasons other than zoning affecting supply. Regulations exist for a reason. While some of those reasons are of debatable merit, some are good. You probably don't want to place housing in an industrial area. There are environmental implications that can affect public health. Likewise, you probably don't want to place a ten story apartment block in a neighborhood filled with single family housing since it is going to interfere with other property owners enjoyment of their own land. Yet there is more than zoning to consider. Building codes raise the cost of construction, and ultimately cost of housing. Historically, parts of cities have been lost to flames because of how building were constructed (among other reasons). Now I am not saying that all of the regulations are good. On the contrary, I believe that they are too restrictive to meet housing needs. On the other hand, you will always have someone calling shenanigans based upon the philosophy behind those regulations and how the community views that philosophy.