This isn't 100% correct. While there are quite a few Offensive summons there has been equally just as many supportive ones: Carbuncle, Sylph, Seraph, Phoenix, Golem, Unicorn, Siren, Fenrir, Alexander, Lakshmi, Phantom, Queztalli, Catoblepas, Chocobo, Zona Seeker, Ragnarok, Cait Sith, Moogle, Magic Pot, Faerie. It took SMN an extremely long time to get to the DD status it has today, but the simple fact that we have wards means that they are intended to be used. No one is saying to screw RDM or BRD, but to simple not forget about SMN's supportive side as well.
Also incorrect, If you want to talk about conceptions of class creation from the series let's talk about how RDM isn't an enfeebler at all, nor was GEO a "support" class. GEO has actually been a DD class since its debut in FF3, Same as FF5, and Mog's Moogle Dances in FF6, and a DD in all FFT games. Like wise RDM was a Attacker class that could heal and cast black magic. It was only late in the stage that SE decided to make RDM an enfeebler in this game, but failed to give them the tools to do so, much like the problems that BST faced when they were nerfed.
I'll give you that BRD is a true support class and has fallen the hardest, but again, no one is asking that they not get buffed too, because they offer special status slots that can stack things with other buffs that can be given.


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