Tanks

[Caraway]

Perhaps the same could be said for all jobs.

Holy Castlevania: Symphony of the Night flash backs, batman!

Anyway, on topic....

There are few tanks because people put a huge amount of importance on the tank role in dungeons, and if the tank screws up (or even if they don't and someone else scres up) they get the slack for it. Healers are in the same boat as well, though to a less extent because they can pawn fails off to the tank too ("Oh I didn't heal the DPS because it's the tanks job to make sure they don't get hit" etc.).

That said... I find this whole concept of one job being more important than another ridiculous. Every job is important and needed. You won't see teams of just tanks and healers clearing content at an appropriate level/gearing (not group content anyway), at least not in this game where there are so many encounters with DPS checks.

All roles are important and you can feel it when someone doesn't do their job.