So then tell me why he is better off rolling a scribe mage for group pvp instead of something like a necro mage with the ability to strangle for disrupts, corpse skin for debuff, evil omen for para ganks, pain spike for stam drains, withers, revenants, access to a fairly major exploit, or wisp for team mana regen. Or a tactics mage that brings the ability to bleed dexxers, mortal mages, parablow people, hitting people on the run, and heavy damage combos.
I mean the only real argument in favor of a pure mage is to use it as a stepping stone template to get into the big league templates. That is, if you are assuming that the better templates are too complicated to learn right off the bat.