All excellent points, and why moisture vapour transmission direction/rate must be taken into account during a build. If you live somewhere where AC is the primary mode of interior conditioning, you will build to where the AC will pull moisture in from the structure for removal via the condensate line. If you live somewhere not so tropics, you're going to build where the moisture is pulled out of the home by the natural environment.

Building sciences are both fun and fraught with peril. I'm somewhat excited and cautiously optimistic about Boxabl from a housing manufacturing perspective.