Funny too because despite assassins being non-existent late game or brusiers literally dropping of the meta pretty much mages still have high winrates and have the whole season, the literally the class that has been doing consistently well despite being "weak". Also I dont see how they can possible be useless even when behind, compared to most brusiers or assassins they still offer great cc and poke something that they most other classes other then tanks, and some divers have. But you "ap itemizations sucks we want to abuse broken items like duskblade too" except for the fact ad assassins literally had useless items for so long.
Also you have more reliable burst compared to assassins mages hit their skill shots. I genuinely think mages are the most stable class as of now, they deal great dmg, most arent even broken, are great at every stage, deal great dmg, aren't out of control like assassins become, not useless as jugg's, not broken as tanks, not brain dead and ridiculous as some adc's have become, not broken shielding for adc's not, they offer utility, dmg, and another reliable source of dmg especially if you are the only ap champion on the team you are helping out alot by lessing the amount of armor tanks get. Like what is there really to complain about?