I figured that if they ever get to finish development on proper Egi glamours, they could "extend" its functionality to that gemstone phase (Leviathan Sapphire? Ramuh Amethyst? Shiva Diamond?).
They're still a thing (and they can be glamoured, as ever).
But from what I've seen/heard, it seems they're just there to serve as "focus" for SMN's pet related skills (like that barrier, that "aetherpact" buff and the Trance/Demi phases).
Thus, they'll no longer auto-attack.