Do you remember those GE dishwashers from the 1980’s? The tub had a rubbery type coating that was easily scratched. Then moisture would get underneath the coating and it would rust out in short order. Talk about bad design. And there was the dishwasher with the heated dry switch in the door that would short-out and burn down your house.
Early 1980’s, we switched to a plastic tub from the epoxy coated steel in 1984. The plastic tubs last forever, never rust out.
The new dishwashers only get .8 gallons per fill because of federal regulations and will not wash dishes.
... on the plus side, the dishes *were* dry.