I’m trying to remember. I believe his premise was that post and beam are the load bearing elements. The skin can be its own structure, instead of being built into the outside of the wall, and therefore you aren’t puncturing it every eighteen inches. And your insulation isn’t similarly transited by a conductor.

He was calling for preformed exterior segments you bolt together.

They need to be made out of something unless you like a very open plan. In the past they might have been made from wattle and daub, or you could use studs, paper, whatever you want since they're not structural.