I've always found it kind of annoying that the samurai job doesn't sheathe like a samurai, or that dragoon doesn't spin their lance/glaive with some flair that results in them landing it on their back. Even Dark Knight could have had a "Cloud-style one-handed sword spin" that lands it on their back.
I understand from an animation standpoint, the standard "put it away and be done with it" animation is far easier, but it lacks immersion.
Perhaps something for the future? Could be cool. Not necessary, but it would add immersion and cool-factor.
The same could be said for adding unique unsheathing animations as well.