I actually don't have a problem with mage supports because of champions like
who don't have (much of) anything meaningful outside of utility. They can't do damage, they can't tank, all they have is situational things. Granted, used tactically, those can be huge in both laning and teamfights, but even so. Take away a mage support's damage in favor of utility, and they can't accomplish much in the long run unless they're absurdly on the ball with their kit, and take enough utility off the damage and you may as well just go midlane (although I take
support half the time I get filled, so there's that too)
Heaven forbid a support should actually be able to be helpful if their lane is doing poorly.