Possibly due to the great level crush of 6.0, possibly due to zero attention since 2.X.. Chocobo companions are quite overdue for an upgrade.

They are simply worthless at this point. My healer chocobo cannot keep me alive in the 80s and they're adding very little dps as a free stance.

Only thing they definitely contribute is frame lag and Aetheryte congestion.

It's either time to get rid of them altogether, as the lack of attention seems to suggest they want to, or it's time to bring them up to snuff.