The problem on a concept level is that SMN is about heavy damage dealing...coming from the avatar/eidolon/summon. That's why people remembered Rydia in IV, Dagger and Eiko in IX, and hell, even Yuna in X.
On the spellcasting side, summoners prior to XI's incarnation were backed up by a secondary school of magic. The devs assumed this would be covered by the subjob system, until people figured out that elemental spells cast at half-level profficiency due to skill ratings were (rightfully) stupidly gimp. The fact that healing spells had no such penalty did nothing to help.


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