Not the same thing. A DD typically only has the major role of dealing damage. Rdm has a decent amount of Self target spells for mitigating damage - but can't hold hate/isn't asked to tank. Gain Spells are completely replaced by boosts which help everyone not just the user. Other mages either get haste or will be able to sub it /whm or /rdm soon. That leaves Phalanx 2.