To me it made to the game unique. Feeding your Mag is a staple to PSO. There something you just do change and your personal Mag is one of them. It the game, it add to the role playing environment. I would think Sega would capitalize on this unique aspect. The way PSO did it back in the day is that you would find your special Mag out on the battle field. Some were rare and unique and depending on what you feed it how it would evolve.
Maybe it in the plans as we move forward......well I pray that it is personally.