A quick swap is a really good idea though, it could be used for more than just having MF on a second set of equipment. And it changes almost nothing except that you can swap gear 1,000x quicker with the press of a button and allows for more tactical decisions throughout the game. It also allows you to hold more items in your inventory, if you chose to use it as storage, or simply opens up space wherever you used to store your second set of equipment, be it for a different set of tactics, or for MF.