I only do this when there's a tactical advantage. In Aurum Vale, for instance, there are rooms where you can either pull groups back into a "hallway", or risk aggroing more than the group can handle. Also, in Pharo Sirius, near the end, there are two slimes on the top landing right in front of the Aether valve. I'll tell groups to stay at the landing below and pull one down at a time. The reason for this is two fold. First, it prevents damaging everyone from the Aether cloud and also prevents pulling both slimes at once and missing a stun on divide.


So again, if your tank is more comfortable with controlled pulls, let them do it. A lot of times, they do it for a good reason. If you're a DPS player, wait until the tank parks and gets off one AOE threat move before nuking.