Fredy-san
As attacker, I usually does not bring meat, but I still bring bandage or wish. I even bring defib sometimes.
You just won't know when:
A. Your tank is lagging or disconnected (knowing zOMG server is kinda so-so connection to faraway players) > You should drop some heals for your tank
B. NF off aggro due to someone lagging thus accidentally release rage attack > You gonna need to heal ur team because tank healing alone is not fast enough
C. One of important buff like Div or Halo fell off but you are not assigned any self-rage buff like rock/tef/pot/sphere > You can use bandage at least for that.
A) If you lose your tank you'll have to get a new one and might as well restart the YM run
B) Bandage won't be enough to heal an entire crew even assisting the tank. It's far more effective for whoever has aggro to run. If you bandage you're contributing to the problem by building more aggro for yourself when the tank already has trouble keeping it. Furthermore, it's easier for a high dps crew to kill a NF when it's raging because a Tank can keep up for a short period and if there's around 2k health left then it's better for everyone to let loose because a Tank can heal for several rounds if they move into range and use diag+raged wish and bandage anyone low on HP.
C) Div and Halo are not important enough to self-rage over. A R1 Div or Halo is sufficient until you build enough rage on enemies. I've dropped Halo entirely from tanking crews and have been able to clear YM. Furthermore, div doesn't regen hp until people stop attacking, so r1 or r4 or no div at all doesn't matter for anyone while they are attacking or healing.