I absolutely disagree.

There's a reason why a group have cleared A4S in i190. There's a reason why stacking raid buffs together is effective to push through mechanics and clear fights. There's a reason why every single successful progression group understands the important of stacking buffs/debuffs together. Every single speed clear group synchronises buffs together. It's an extremely effective.

Your group maybe timing your buffs incorrectly and using them in a manner that is completely ineffective, hence why you can't see the benefit of it.

http://www.fflogs.com/reports/RxH2kD...86&view=events

That's a 10min 03s A3S. Notice where the Dragoon is using Litany, blood for blood and his potion. Definitely not during the add phase.