We have ranged dps and melee dps already so what more do we need? Anything more will end up ignored like the titan egi and would give a false sense of varity as well as lead to balancing issues. In the end everyone would still use the egi that gives the biggest dps.

Egi glamours though it comes down to what they have time to work on. Considering a new egi appearance would only really benefit the summoner in question who uses said glamour then it is easy to see it is not a priority. You can argue then why did music playing come out for bard? That actually is something everyone can enjoy even if they don't do it themselves. You can listen to the music a bard plays. Seeing a new egi glamour doesn't give you the same satisfaction.