To be perfectly honest, SMN feels more like a grind to play than it should, what with its immense rotation and lack of actual "summoner" gameplay. At least in my opinion.
To fix this, I have devised a rather simple solution.
Step 1) Add more summons to the mix for every Primal defeated.
Step 2) Remove shared CD from the skills for each summon and instead put them on "summon specific" CDs.
Step 3) Allow for a cycling mechanic. As an example, I summon Ifrit-egi, use his specials, one after the other. After his abilities are used, he unsummons automatically (and becomes unable to be resummoned until such time as Bahamut or Phoenix are used), allowing you to summon the next Primal-egi. Once that happens, use the abilities as per the previous example. Rinse and repeat. Upon summoning Phoenix or Bahamut, reset the summons to the "useable" state and begin anew. (in order to facilitate this, pet taunts and and increased threat generation will need to be removed and replaced with something else to make Titan useable without destroying party threat by "taunting" enemies).
Step 4) Make it so that using all of a summon's abilities contribute to the SMN meter to summon Bahamut (1st cycle). After using Bahamut, you will have a timer. If the timer runs out before you refill the meter, it will reset back down to Bahamut. Otherwise, summon Phoenix once the meter is refilled by using the skill (2nd cycle). Timer will depend on how long it takes to cycle each summon. If you're very slow and prefer to use your spells over your egi's abilities, you will most likely never summon Phoenix.
Using the above method would not only make you actually feel like a Summoner, but it would be far more entertaining to both use and watch unfold. As it stands right now, SMN is basically a BLM without a focus on the elements. It's boring and feels uninspired.
What do you guys think? I've had this idea for a while.
I have posted this in another thread, but figured I may as well start a thread about it to give the idea some awareness.