I always assumed in a world full of magic, there were plenty of small personal magics and cantrips that everyone just used to make life easier, like one to keep your hair from being blown around and kept trimmed, or one that kept you from overheating or freezing in harsh climates, or even ones that made it so you don't have to use the restroom.
It's the only explanation i could come up with for why almost none of the final fantasies have a bathroom, and the ones that do, have them in the dungeons. (presumably such cells would be anti magic, preventing such convenience spells from being cast along with the greater ones you could use to escape.)