if its ok i would like to share my idea too on how i think will fix the summoner.
as u guys suggested,make the egi system to be instead be based of the demi system where u summon the big version of a primal rather then a smaller one like for 20 seconds however their summon cost is mana+1/2 aetherflow charge.
and my idea of a summoning goes like this
the primals attack the target with auto attack.
Lvl 30: Summon ifrit. Summons a Demi-Ifrit to fight by your side, duration :20s CD: 30s. cost 1 aetherflow stack + mana:200(for example).
lvl 30: primal attack- orders the primal to attack the target.just like the carbuncle it also auto attacks the target u hit with a spell..
Lvl 40:summon titan. Summons a Demi-Titan to fight by your side,duration :20s CD: 30s.cost 1 aetherflow stack + mana:200.
lvl 42: primal blessing(trait)-upon summoning, the primal grant u a blessing(ifrit-extra damage to single targets,titan-shield+reduce dmg taken.garuda-aoe damage increase ....
lvl 45 summon garuda - Summons a Demi-Garuda to fight by your side. duration :20s CD: 30s.cost 1 aetherflow stack + mana:200.
lvl 48 primal gift(trait)- the primal u summon add an effect to ruin(ifrit-dot on target,titan-increased damage,garuda-makes it aoe and spread inflicted debuffs on nearby enemies like using bane...)
Lvl 50: Enkindle. Causes your summon to do a big attack. Carbuncle: Ruby Light, Ifrit: Hellfire, Titan: Earthen Fury, Garuda: Howling Gale, Bahamut: Mega Flare, Pheonix Revalation. can be cast in the last 10 remaining second mana cost:500.
and then during each 2 lvl the summoner can learn a new primal summon like leviathan, rammuh and shiva for example.
and then for the big summons like bahamut and phoenix instead of DWT and FBT that are seperate maybe combine them to one trance something like primal trance that get filled by each time a summon preformed and once it fully charged u use it to summon them.
i believe that with this, u dont need to order the primals much except for it to use enkindle which saves some buttons ,u can choose which primal u want based on the situation as well give more summoning options and preferences while keeping the idea of summoner using bio,miasma +ruin intact