It's too late for this stuff. They may build on the Trance stuff or potentially add another Egi (though I don't know what role it'd fill) in later expansions, but the Summoner job as presented in FFXIV is really strange when compared with past iterations of Final Fantasy summoners. I would've rather they performed short (maybe 2-5 GCDs) summons of primals to the field that gave you some manner of control over the primal, dealing damage by proxy in a more elaborate manner than setting Ifrit-egi on Sic and proceeding to poison everything. When did summoners become poison experts?