Exodus, you have to break a few eggs to make an omelette. It's clear the current design of Summoner is broken, and it's clear the devs have repeatedly stated that they hate pets like the egis from 2.0. Where there's a will, there's a way, and we can very clearly get a much better class if the devs are willing to rework the class, which they should have done alongside MCH instead of doing a minor rework that functionally broke the class.

This is also why I try to find ways to keep the old pets around, at least at lower levels, instead of just flat out ripping them out. E.G. giving Arcanist the trance system at level 4 instead of giving it at 58, and making it summon emerald carbuncle.

If there has to be minor rewriting/retconning of the story because the devs didn't have the foresight to design the class thematically perfectly from the first, then this is one of the cases where I think most players can actually accept it because until SB, Summoner has not once actually been a summoner, and ShB is the closest to SMN it's ever been, but the pet is starting to be a very terrible system that is showing how much neglect it's been given.