Pulling mobs all depends on the game really with XIV only the tank should be doing the pulling, they're the one that gets to decide on the pace for the dungeon. As a tank when you get a dps that keeps pulling mobs they have to chase after those and trying to maintain aggro on everything can get to be a challenge sometimes, typically when a dps keeps pulling after being requested not to usually does result in getting them getting kicked. From a healers perspective you have to heal a lot more and heal more ppl than you needed to because of a dps pulling extra mobs, if a tank choose to pull those mobs yes there is still more healing but it doesn't end up being all over the place. For me if a dps is pulling mobs and has been requested not to if I'm healing (now this may sound mean but....) I will usually let the dps die and solely focus on keeping myself and the tank alive and trying to keep the other dps alive but they're still third on the priority list.