Imagine if we can carry our retainers with us on it's own mount - say a 4 seater retainer mount, where you control the mount, and have your retainers there with you. Can interact with retainers on mount without being dismounted.

Though, whatever form the mount would take, hopefully it would be Lore friendly. Imagine being able to check retainers whenever we want in middle of nowhere when their Ventures are done, or put up a market board listening in between battles without returning to a city like Limsa, Kugane or Radz-at-Han.