While I don't think it's wrong that tanks get bonuses the most often (since the role is in the highest demand), I do think there is a different problem with role bonuses. There will often be cases where I can get an instant queue for a roulette as a healer (generally low level or guildhest, but sometimes others), but the bonus is set for tanks. The problem is that the bonus doesn't update often enough to account for the real demand, so my entry time is often faster when it is not a healer bonus than when it is.

Either the rate of demand needs to refresh more quickly, or there needs to be a way for both tanks and healers to benefit from the bonus when both roles are needed. I'm sure it would help the rogues/ninjas and other dps with long queue times in lower level dungeons as well, so such a change would be mutually beneficial to everyone.