Summoner Early Post-Launch Feedback at level 80

[Taranok]

I'm completely against removing them, since they're integral to this game's lore.
So "altering" will have to do, I guess.

Lore is a poor excuse to justify keeping a class broken. The Egis can be worked in in different ways without having a pet that constantly drags the design of the class down. Having consistent lore is important. Having a class that feels good to play is more so.

I think they're fine the way they are, level-wise.
Maybe post-Lv.60 would do it.

Having a class that constantly changes its styles where a primary, CORE mechanic of it isn't even acquired until level 60 is not good design. Machinist suffered from this in SB where you couldn't even realistically use heat until 62, and got no real benefit until 64. Getting a core mechanic at 60, 70, and 80 is bad design. 80 is at least semi-justifiable because it's expanding on the mechanic, but 60 for a core class mechanic is not. (Okay, technically 58, but still). Even Black Mage suffers from this both critically (Fire 4, Umbral Hearts) and less critically (Every QoL change post 60 that should be gotten sooner).

I mean...that's more or less how Demi-Primals currently work.
They just need to further emphasize that particular aspect of them.
Like say, using their respective Enkindles immediately on entry/exit (similar to MCH's turret).

By one-shot, I mean it summons, does a single attack, and then leaves.

And this is the point where I completely disagree with you.
Each FF game has its own "take" on certain jobs and stuff.
Otherwise, Scholar wouldn't get fairies, Dark Knight would be sacrificing its HP for certain attacks (and not being a tank), etc...

Nothing about what you said has any bearing on the current summoner or its problems.

Do you want a class that is broken by design just because of lore? Do you want the class to ever live up to its hypothetical potential? Because dragging it down due to the poor design decisions of the past no longer aging well or because of story is a terrible excuse. Summoner as a class design has suffered long enough. It needs to be fixed, and fixed properly. And short of a full rework, it will never be fixed properly. It can have a unique take on the class compared to past iterations, that's fine. But it needs to be a functional, coherent class.