The most important part of DPS in progress is that you do the damage in the right place at the right time. While unlikely, it is possible that a missed haunt during a particularly crucial DPS phase could lower your DPS in that particular time frame enough to have a negative impact on the raid. It probably won't have a vast impact on your overall damage, but could mean the difference between.......lets say getting an extra
stack of damage on Elegon and not getting it. That could potentially cause wipes.
I don't like the idea of risking that when it could come on the try when everyone plays really well.