basically this yeah.
Monk- Doesnt ever get much in terms of quickly spammable aoe, arm of the destroyer has 50 potency and rockbreaker has a requirement of two attacks before it unless you use a cooldown gained at 50, the rest of their aoe is also on cooldowns.
Dragoon- spammable aoe obtained at level 46, pretty late in the game (benefits from comboing into it)
Ninja- death blossom at 42 (60 potency), has to rely on mudras for any other aoe. (30 second cooldown)