That lame argument of "reinventing the wheel", "no need for a new cartridge when the old one works just fine", bla bla bla bla.

If companies weren't constantly coming up with new designs and marketing them we would all still be hunting with flint tipped spears and driving model A's. We wouldn't even have gun powder.

So save that BS argument and be dang glad that we have such a variety of cartridges to choose from and own.