Intro:
I think for me the problem with SMN is that it does not focus on the jobs' core ability (Summoning). Of course it is true that a number of Summoners in the FF franchise have indeed utilized other magical abilities (White/Black Magic). However these are abilities shared with other jobs, jobs that utilize them as their core abilities. SMN's core abilities is Summoning. That should be their focus.
I should stress that SMN's current incarnation is not broken in any way, it works, and I enjoy playing it. However that does not mean it is a perfect job and could have been implemented better. I have mentioned this on another thread recently, but I think a play style much like Yuna from Dissidia would be far better suited to SMN.
Ability/Egi Overhaul:
Instead of having the Egi as a separate entity (pet) with it's own A.I, health bar and abilities. The Egi should become nothing more than a visual effect that follows the SMN. Summon I, II, III and all DoT's should be removed and replaced with the Egi's abilities. When the SMN uses one of these abilities, like Flaming Crush for example, Ifrit is instantly summoned and does the attack. He will then stay summoned as long as the SMN keeps using the abilities linked to Ifrit. If the SMN switches to abilities linked to Garuda or Titan, then Ifrit would be dismissed and the other Egi instantly summoned to carry out the attack.
This would shift the focus entirely onto summoning but also prevent the Egi from dying and making the SMN useless, as it is no longer classed as a pet.
Primal Aether Stacks/Enkindle:
The SMN could even gain stacks of Primal Aether of a specific element when using their abilities in unison, which they can save up to use Enkindle. For example SMN could open with Radiant Shield > Burning Strike > Flaming Crush > Crimson Cyclone > Enkindle. Each ability used would give SMN a stack of Inferno Aether, giving a total of 4 stacks. Ifrit's Enkidle could then be used. Which could have a totally new visual of the Ifrit Egi dissipating into a void portal and the upper torso of the full Ifrit Primal emerges out of said portal and does Inferno and is then dismissed (much like Yuna's Aeons in Dissidia) Ifrit's Enkindle would then go on cooldown.
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But each Egi's Enkindles could be on a separate cooldown encouraging the SMN to switch to a different Egi linked ability set and combo those moves to utilize Garuda's or Titan's Enkindle, via their respected Primal Aether stacks (Vortex Aether, Crag Aether).
Dreadwyrm Trance/Deathflare:
Dreadwyrm Trance would still remain, but instead you would gain Aethertrail's from each Enkindle in order to build the stack of three needed to use Dreadwyrm Trance/Deathflare. Which again could be changed into another void portal where the upper torso of Bahamut emerges to do Deathflare and then disappears.