Maybe our definition of significant percentage is different, but I honestly don’t find it too much. A notable exception is some kind of generated objects, from

Maybe our definition of significant percentage is different, but I honestly don’t find it too much. A notable exception is some kind of generated objects, from say, wsdls getting transformed to different dtos, but in this case MapStruct is a godsend, and is overall less error-prone than doing it even in a null-safe language. (Manually copying fields won’t tell you if a new field is added that should also be copied, for example).