Quote Originally Posted by SamRF View Post
Efficiency. (don't take this out of context please, consider the full post I'm responding to)

They shouldn't feel uncomfortable in the first place, if they do, I would argue that they have bad/unfair judgement (which is okay) and need to work on that. I hear many say that they encounter healers that do let them die. In that case, unless it's obvious that healer won't be able to heal you (hard cast rez, dead, ..) you should trust your healer. If it did lead to party being wiped, then by all means do use Vercure/Cemency next time for insurance.
Again, not everyone plays for maximum efficiency. While the only way to learn your true limits is to cross them, some people just don't like to fail. For them it's better to pre-emptively use the heal even if it makes the run one second longer than to cause a wipe and waste several minutes doing the boss from the beginning.

Quote Originally Posted by SamRF View Post
There might be an exception for Paladins in some (specific lower level) dungeons when either healer or tank isn't up to par with their gear and they overpull. Then it could perhaps be a good idea to throw a few clemencies when you don't have any defense buffs going on while taking enormous amount of damage. But it should never be as a respond to how much health you have because you can't predict that with the cast time. A response to how much damage you are taking can be debatable, a response to how much health you have is imo always bad practice in group content for PLD (except for those exceptional cases you know healer is unable to heal).
If you don't have the fight memorized it's difficult to know how much damage you're going to take, so how much HP you have is all you have to go by. And if you don't know what the boss is going to do next, you might not want to sit at 30% HP and trust the healer to know when to heal. Some players don't have the same capacity for learning as you and I, and tankbusters in particular don't offer any universally recognizable clue of what the attack is about to do.