Ranked games

I am playing league for a while now and I have noticed in league champions have certain characteristics for example a marksman , tank , mage , support ,which is needed for a certain lane but people abuse and play different champions in different lanes. I have countered today that thresh wanted to play top , akali top , vane top. I think there is a reason why champions are build with certain qualities. Players abusing champs that are not well for other lanes causes defeat for other players. which bring my attention to people trying different things clearly shows on youtube , and after seeing that users want to do the same in a ranked game. Which most of the time cause a loss for players , suspension due to rage and ranking down. I think league should update system where only certain champion should be used in a lane just like a Marksman should be only used for bot lane in a selection mode. I think it will give more depth to this game and would increase champion worth.