I believe you're speaking about Bardams Mettle, or w/e it's called. It's moreso the exception rather than the rule. Most dungeons are really simple and aren't hard as any healer, but there are a few that are notorious for being rough on healers, namely Aurum Vale and Bardam's. I wouldn't worry about it too much, most dungeons in Stormblood aren't any harder than ARR.