While I'm maining a tank I rolled up a second character to be more caster focused as an ARC/SMN but will do all caster Job eventually.

During a Copperbell mines run I had the tank ask me to stop casting all my DoTs on everything in a pull and focus on the same target the other DPS was. I tried to explain to him that the DoT's soften everything up to make it faster to clear through the group as after I'd DoT everything I'd burn the focused target down and then reapply to the others and burn the next, etc. He tried to counter with the hate risk, but I responded that I hadn't pulled hate off him yet as his aoe enmity usage plus him changing targets through the mobs means my meager DoTs aren't even a blip on the hate radar. We finished the run with a bit more grumbling from the tank, but no deaths occurred.