Ya okay. Fight against Demon Wall with 3 tanks and a healer and see how far you get.
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Think you missed what Johnist meant. Every part of the party is important that's clear. We lack tanks and healers because they are the bread to the DPS sandwich, its takes more skill ensuring your party doesn't wipe - hence the responsibility roles comment. As a DPS, yes there are a few things to keep an eye on and do, but the roles of tank and healer require much more thinking, planning and executing then that of DPS classes. Plus people like to see big numbers when they are killing stuff over healing or watching threat meters. Not many DPS get blamed for a run wipe do they?
I'd say healers but there are actually quite a few. It just seems like there isn't a lot because they are in such high demand they are always doing something. Tanks are indeed the least common, gladiators mostly. I almost never see them in open world but then again they have near instant queues and if I could dungeon spam I would. Ironically gladiators are also the most commonly poor played class. Meaning most gladiators I party with are absolutely horrible. Everytime I get one who can't hold aggro or doesn't mark etc... makes me facepalm and want to roll a gladiator just to see it done right.