Per no. 5, that was the whole point of the elemental celerity buff to black mages. It was a travesty that scholar casted faster than the specialist in the job. Black mage was really drug down at 75 by slow casting and no mp restoration. Both red mage and scholar significantly outperformed black mage over time due to black mages slow casting and needing to rest.

Besides, don't scholars have celerity to cut their dark art casting time, and penury on the other time? Scholar is supposed to be the strategic mage, it isn't supposed to have more proficiency than black mage and white mage without using strategms.