I decided to start leveling all the crafters (minus CUL) and realized while I can buy the soul stones to make them all specialists I don't have the space to store them with all the other job stones. Is this an oversight or done by design?

Seems odd since all the new crafting recipes basically require to be a specialist to make the items anyways. Or is it possible to have more than 3 specialists and I'm not seeing it beyond not having all the jobs? Would seem silly to force us to choose between crafting and having the combat classes.