User blog comment:Ysana/Champion Versatility/@comment-1990160-20130127205617/@comment-4652200-20130128003845

They try to justify this by saying it's there to make the game noob friendly. So characters type can be determined only by visual identification (without having to know their kit/looking at their items) for example:

character X is a AP caster because char X looks frail or wears mage-appropriate clothing, character Y has a sword(other melee weapon) so he is AD bruiser/caster, character Z looks is physically tough/bulky/big so he must be tank.

Of course they fail their own explanation by having characters such as Morde and Diana - who based on their appearance should be AD.