Healer dps in difficult raids and trials.

[Wice]

Your damage per second points on those contents have to be equal or higher than your heals per second points. If it is not, change role.

Ideally, yes this is true. But ideally everyone in the party always does all mechanics correctly and never ever get caught out by AOE's and thus you rarely find yourself in a situation where you have to cast heals on them and they never need you to raise them.

Lets not forget that one of the big caps on Healer DPS is how good everyone else in the party is today.