The old parts of the steelmill I worked at in Ohio were built with a steel I-beam frame and then filled with two rows of brick for walls. Whole walls would get blown out, knocked over or just fall over from gravity and the roof would stay up, I think the walls were just there to keep the wind at bay. I think the the Post-Beam system you see here is fine as long as they use enough portland to steady up the rebar and protect it from the weather.