Honestly when I think of a summoner, I think FF:tactics, cast spells and at times summon a giant monster to do its move and leave. so if they were to remake it so that you build a summon gauge(aethertrail attunement) and expend it on a summon to attack for a time and make it do its signature move or have some effect or buff etc. I think it would open more doors for including the other primals.