I look at this quest from the view of the raid leader. It is for the most part more difficult to recruit clerics for this quest then any other class so any strategy utilizing less clerics is an advantage. The end result is you fill up the group and do the quest quicker when you have less clerics. Removing curse isn't that big an issue really - it does cost the cleric more mana because they will have a few heals not land, but otherwise not that big of an issue.