AOE is limited by the amounts of HP on the adds -- ST is not.
Right now, there are only 1-2 kinda AOE fights in the game.
1) Akylios, as there are constantly adds, and in the important P4 you have Aky+Jorna / Jorna+Lasher.
2) King/Prince if you tank them next to each other.
Oh, and if Warrior passive cleave doesn't cut it, there's SC Mages.
And that's the problem I still see with Sab - although for pure AOE Cabs are top or even the best, nobody uses them, because they can only AOE. Besides all its other problems, Sab is designed right now to work similar to Cab... I don't see where this will make them desirable in raids compared to superb BS ST or flexible/utility MM.