I personally enjoy the changes Summoner got with Endwalker. Now it feels like you are actually a summoner. I know people miss their DoTs and Ruin spam, but pre-EW Summoner didn't feel like a summoning job. You threw out Garuda minion on trash mobs, then Ifrit minion on bosses. Occasionally using their special moves.
Now, you're pulling out Ifrit, Titan, and Garuda as needed. Titan is a more valid AoE usage so it's not left behind. And at 90 you get to summon the actual primal versions, not Egi.
Okay, now what do we need to improve on this. MORE SUMMONS!
So I came up with this idea for two more actions to learn on the path to 100.
Summon Affinity and Summon Aversion.
These function while under the effect of Ifrit's Favor, Titan's Favor, and Garuda's Favor.
Affinity pulls out a new summon based on it having an affinity with the embodiment of the Favor, or the element.
Aversion pulls out a new summon based on it having an aversion (opposition) to the embodiment or element of the current Favor.
Examples:
Ifrit is fire.
Affinity could be Ravana. Aversion could be Shiva.
Titan is earth/mountain.
Affinity could be Zurvan. Aversion could Leviathan.
Garuda is wind/storm.
Affinity could be Ramuh. Aversion could be Sophia (equilibrium/calm which is opposite to a violent storm)
Action: Elder Summon
With 3 Affinity, you will summon Hydaelyn to be suffused with her divine light.
With 3 Aversion, you will summon Zodiark to be suffused with his eternal darkness.
With a mix of 3 Affinity/Aversion, you will summon Zantetsuken and temporarily become Odin for a melee attack.
Rough ideas, certainly. But it seems like it'd be really wild to add in more summons with different effects/abilities at the highest levels of summoning that we'll be reaching. So instead of just the same old thing of Ifrit, Garuda, and Titan, we can instead gain access to 6 new summons just beyond 90, and 3 more on top of that at level 100.
Of course, this will probably never happen. But it's something I'd love to see worked out for the 91-100 SMN actions. :3