I have a lens that is just an achromat meniscus, f 4.5, two elements and a diaphragm, about as simple as it gets, but it weighs something like 6lbs (did I mention it's a 16" Kodak Portrait lens?). So (relatively) small maximum apertures and mechanical simplicity do not a light-weight lens make
Good point. Actually, I was kidding about making the 50/1.2 Nikons and others, and selling them stripped down. Kind of like a nokton barrel lens.