I've wanted ability glamours for years, and I legitimately thought we might see them in Endwalker. Some toggle to use an older animation would give a little bit of customization. Could even be fun if you see like, 4 White Mages in a 24man and they're all using slightly different loadouts.
Hell if they could even unlock new ones and let us just pick those glamours. Complete some achievement related to Warrior, get some new Inner Release animation, or clear content on WHM and bam, new animation for Presence of Mind.
And obviously this would only work in PvE, seeing enemy's abilities and knowing what they can and can't do is a major aspect of PvP.
And I hate to say it but if it gives them incentive, they could even put some on the mog station.