i think the problem with the changes are twofold. First the ifrit changes seem to be made to lessen the dependency on Swiftcast, but all this really achieves is moving swiftcast from Ruby Rite to Slipstream. Second, the buffs are so minor they will barely be noticed. But ultimately the major issue is that these changes fail to address the core issue Summoner faces and the SL change actively makes one issue worse.
For me these are:
1- overly rigid Rotation, little to optimise.
2- Majority of the rotation is executed by spamming a singular reskinned button a set number of times with a singular deviation whrn you have titan out.
3- There is nothing to track and nothing to compel or reward effort.
4- Carbuncle does nothing.
Possible solutions:
1 - Restore Bahmut and Phoenix to their functions within SHB - this does mean we will have to deal with some Demi Ghosting, but it would mean that effort = max WW which gives reward for actually play. Or at the least give phoenix its 1-2 combo back.
2- Further diversify the Arcanum summons, have them provide something that is built and then spent on an action so that if arcanum is done wrong, then we lose use of this skill. Chnage the GCD Rotation and lessen the number of instant casts. Smn is a caster after all.
3- points 1 and 2 would address this.
4- Carbuncle doing nothing and having no purpose, is partially an issue with the changes to egi's themselves. One potential solution would be to have carbuncle be permment and do something alongside the summons themselves, either similiar to a WW or a mechanism that can buff certain summon abilities. Another option is to change Fester into a carbuncle attack that is commanded from the summoner but has an animation that uses Carbuncle.
5 - Possible final - Alter Phoenix so its "utility" can be stored and used once every 2 minutes as and when required, rather than forced during the phoenix phase.
These are the things i can think of, but i do want to stress: The Rework was the right step for summoner Identity, but it needs some refinement and adjustments in order for the job to be as Engaging and Rewarding as other Jobs.