they wern't designed per say to drop a wing.
Its just when the pilot does something stupid and against what they are taught the wing will drop. If you stall them correctly as per the book they will do it wings level with no wing drop (but they are all old now and each has its own characteristics). But put a hint of incorrect control input and the wing will drop, but not in a dangerous manner. All the cessna pilots poo themselves because it just seems harsh compared to the mushing none event they are used to.