If RDM get even HALF of what BLU has, then I'd be very happy. You forget I am a BLU, I know ~exactly~ what a BLU is capable of, both in offensive roles and as the 2nd best healer in the game. Yes the dirty secret BLU's like to avoid answering is that SE has given you more support options then pure damage options. BLU/WHM gets P.Embrace, M.fruit and Cure IV, all on separate timers. You get Erasega on a ridiculously lot timer, something everyone else has to burn accession for. Stoneskinga, super blink, then all the mdef / mab buffs that you can aoe for the proper moment. You get your own self refresh and haste, and from /WHM you can cast the exact same haste that everyone else gets. One light aoe sleep, two black aoe sleeps, and one ST damage + sleep physical spell. Multiple forms of dispel, even dispel-ga.
And other then 5/5 Assimilation, what else would you be meriting? Enchainment would be the only other one with a decent effect, +50 TP during CA.
So yes, BLU has a 10min JA that makes it's buffs aoe. And it's not just haste, that would be one of the worst use's for it. BLU gets tons of damage reduction buffs, Saline Coat alone is gold. Several shells used to use Diffusion Saline Coat on Ultima (back at 75) to survive Citadel buster. Currently BLU is one of the most overpowered jobs, due to all the buffs SE keeps throwing at it. It gets a useful spell every update, so many useful spells that you can't even fit them all on at once. You get just about every JT in the game and JA's that enhance those spells to allow you to deal more damage, apply more status effects or just self SC. And need we go into a single BLU using Charged Whisker to farm pretty much anything they want.
Do not even try to attack the BLU reference. It was done deliberately to illustrate how aoe buffs for things like Haste already exist in the game and that it wouldn't be breaking anything.