The interesting take on Tanks being Tanks and Healers being Healers, is that theyre by nature, unbalanced, so in order to counterbalance healing, it would require healing (or tanking in a tank's case) to be punished in one form or another, (like other Jobs having Skills that reduce armor/healing rate or simply having a passive on the users side that punishes spamming) otherwise those two Roles will always tower over anyone else, simply by not being killable.

If that isnt being considered, then even Crystal Conflict wont be much of a saving grace for PvP in this game. There is always going to be a chance for one Team having more Healers or Tanks than others (if we consider the Matchmaker rules they have announced), and unless you can knockback enemies into those Bomb traps (which hopefully are always spell instant death), it will be quite the chore to get even one killed.

All i hope and wish from PvP, is to be able to play my favorite Job and have a decent chance to fight any other Job without being completely deleted by Melee DPS or walled of by insane defenses/heals by Healers and Tanks. It doesnt need to be on perfectly equal footing, but at least be in the realm of possibility.