There also what to summon. The people of ffxiv aren't exactly worshippers of the eikons, its not certain if there's a way to become one. Instead of starting with the primals themselves, summoners could start with invoking the abilities/form/pet of lesser spirits, setting up a hierarchy of summons that may either involve the primal or become useful based on situation.(A ranged summon, a tank summon, a magic damage summon etc.)