I wouldn't mind a spell glamour system, but summoners still don't have a single egi glamour yet. The real problem with BLM is tied to the core game mechanics where you'll cast fire on Ifrit, ice on Shiva, thunder on Ramuh, etc. because there's no elemental weaknesses or resistances to consider. At the point where Fire IV, Thunder III, Flare, and Blizzard IV might as well be labeled unaspected damage in the tooltip, why not just let you glamour spells then?