I mean, if the party keeps wiping time and time again, knowing you can do something and get it done and over with, yes! Absolutly! In a party with friends and testing limits, sure! Just doing it after one try like I have seen some do, nobody learns that way, and leaving incrues a 30 limit penalty.

I would have to say look at things situationally, let people contribute or help. Sometimes shit just happens, maybe it's the healers fault, maybe a lag spike hit, or x,y,z happens.

Nobody learns anything if mistakes aren't allowed to happen.

Also, that said, if you have a new healer, if they are still learning and adjusting, listen to them! If you force a healer to do a large pull before they are sure they can handle it, it's just going to lead to a potential wipe.