Are you familiar with the concept of an enrage? If so stop being so obtuse. If not, it’s where the party needs to produce x damage in the encounter duration. P8sp1 had a requirement of ~62.5k dps, or in the region of 24 million hp to get through in the nearly 8 minute encounter. At the time it would be extremely difficult to meet this check without healer damage, and you would not have any buffer for accidental death. The #1 parse of 6.2, 2 months after release (as in time enough for the whole group to have bis gear), had 75k dps, 11k contributed by the healers.