Especially since certain NPCs already do this. There is a lot of gear where it would make perfect sense for a Miqo or Au Ra to tuck their tail down (such as the Nomad's coats of fending or healing, or the Ravel Keeper's Chestwrap of Healing).

It's unreasonable to adapt every item so that Au Ra and Miqo never clip with it, but an option to disable clipping by hiding the tail would alleviate the need for such a feature, while still being convenient for people who are really bothered by that clipping.