Not trying to grind an axe head.
O scale 6 wheel passenger trucks are stamped metal assemblies with diecast sideframes and steel needle point axles with wheels. Why can't someone provide stamped metal sideframes? ( as replacements and new product).
Why do trucks have to be diecast? They are already more than half stamped metal. Knuckle Couplers are diecast, but the arms and springs are metal. Could a knuckle be cast in steel ? All the other parts are readily produced. We need to ask for a change and not continue to complain. Most accept a higher cost for bells and whistles. Maybe a "better" metal solution won't increase cost. Diecast as a model medium has continued due to hobbiests demand, percieved as "better". Maybe, maybe not.