Riot why do you hate assassins

I don't get this game anymore, its like you made assassins stupid to play, unless someone is already dead or has absolutely 0 defensive items you cant do jack shit late game, I was just playing hexakill with akali, and i was doing fine early game, and the kills where pretty even on both teams, but come late game when everyone is full build i was getting 1 shot and couldnt do anything to help my team because her AD and AP scaling is fucked up, with 430 ap the most i got out of it was my R was doing an extra 200 damage, 200 fucking damage! really? thats all i get for going full AP is a measly 200 fucking damage, im sure im not the only one who feels this way. You guys hate assassins and you should probably just admit it..