It's an exploit but an optional exploit that nobody has to use.
its not an exploit, you can go buy a robe of destruction, a helmet of destruction, a ring of destruction and amulet of destruction and wear em all and there you go, without even enchanting anything yourself, hiring an additional follower lets say in FO3 by killing dogmeat is an exploit, using enchanted items already in game or making your own isn't an exploit and shot for shot magic is underpowered compared to a bow for instance so its not cheating to have low magic costs, that makes the game viable at higher levels, otherwise magic would be useless at high levels..shot for shot its not overpowerful, compared to an arrow..so its not cheating to have low magic cost, the arch mage robes gives a 15% reduction to all magic and the expert robe of destruction gives like 20% reduction all by itself not counting anything else, so reducing magic costs isn't cheating, thats what i'm hearing a lot, so is using potions cheating? how about using heavy armor is that cheating? or swords that do massive damage, is that cheating? ROFL so lets get real here. using enchating, or magic potions and magic arrows and magic bows and magic swords isn't cheating, its just different ways to do damage and have fun.