1) Melee need some form of slow/CC that helps them stick to a target. Lots of people are playing Samurai now because of their unparalleled mobility and the classes that do bring slows can't use them because they are too busy spam healing the crazy amount of damage the ranged class is doing to the melee. Melee need the tools to do their job, the only one that has ANY of those tools is Ninja and they have literally every single tool. Relying on someone helping the melee stick to a target with the limited communication we have is a joke. There's not a single other MMO on the market that has PvP that gives their DPS classes so little tools to help people perform their role.
2) "Hope they reply in kind". For a type of match setting that they want to be competitive, I just LOVE the aspect of relying on my hopes and prayers that they will burst the same time I do.
3) We don't forget that it's team play, it's just....SE doesn't give us any real options aside from spamming "Attacking melee!" 345 times hoping people help.
4) DPS wind-up doesn't really matter at the moment in high level play. Mainly because at any given time you're working through a TBN+Benision/TBN+Adlo shields, so you have a whole 2 seconds worth of actual damage on the person before shields go back up. Just another symptom of class imbalance. Feeling punished for not having certain roles on your team feels great. Ninja burst doesn't happen during Triple Mudra anyway, it's usually Bhava+Assassinate into Triple Mudra.
5) Healers can easily carry matches while the other roles kinda can't. I can't do my job if I'm dead, so playing a DPS class is reliant on the healers skill. Healers and takes are by far the strongest roles in the Feast at the moment. Can a DPS make a difference in a match? Yes. Carry? Potentially, if their teammates are good enough. Solo carry? Nah. Go play Whm/Sch/Drk for that.