I'm not sure I get the insulation aspect. Sure when compared with concrete block wood is better, but wood is still a thermal bridge. In parts of Europe a cavity

I'm not sure I get the insulation aspect. Sure when compared with concrete block wood is better, but wood is still a thermal bridge. In parts of Europe a cavity between two block walls is filled with insulation, so no cold bridge, and it means the structural materials inherent insulation value does not matter. An inner leaf of block also has a thermal mass which means the walls maintain the house heat better in summer / winter. So we have outer leaf for structure / weather resistance, insulated cavity with excellent u values, inner leaf for structure and thermal mass. It's a lot thicker wall, but serves multiple purposes very well, and better than wood frame with insulation between studs.