Er, yes, you mean they don't now? We also had "dip in" pens with a holder for the nib at the end of the wooden body, we weren't allowed to use our own fountain pens until about 13 years old.

(I'm not sure what a 'loadable' pen is. Is that the type which has a rubber ink chamber inside and you use a leaver to squash it and then suck the ink in through the nib? I think of the 'cartridge' ones as having disposable cartridges which you buy ready-filled and just fit into the barel of the pen.)