i would imagine the reason its not just one but 2 is to somewhat counteract some crazy "change dance partner at exactly the right time, for max dps" shenanigans, i mean it wouldn't even make this impossible, it would basically just turn a big hassle for little gain into a giant hassle for little gain but without wanting to diss on squares design department its just something that feels like they would design around in such a way, Mind you while i really think one button press would be enough for the whole shebang it should at the very least end automatically if the dance partner dies.