Lee tends to design with an eye toward innovation. It appears that the object of their innovation is the marketing term of product differentation. Often product differentation is used just to make an otherwise hohum item look a little better in the market place.
So from Lee you get the silly round die boxes that it takes Lee forever to quit using. You get an integral expander that eventually gets redesigned to provide a shorter expander section. You get short die bodies that do not work on some presses. You get plastic drum or plastic chambered powder measures that leak ball powders, bottom pour lead melters that leak, you get a beam balance that that has poor dampening. Then there are the little aluminum presses that break with heavy duty use....