Whatever Happened To Scaling?

Considering all things, I get that "scaling" champs are slightly toxic in the game, but what are you going to do with those "supposed" scaling hyper carries? No one in this game actually "scales" anymore, except Yasuo who turns into a monster that no one can duel late game. People like Jayce pub stomp from the beginning of the game without losing too much effectiveness late game. Then you have champs like Vayne whose sole purpose is to have a terrible early game and monstrous late game, but she's being pub stomped all game from beginning to end. Then you also have Sivir whose also scrapping the bottom of the barrel.

My question is, what are you going to do with champs whose power spikes are so unachievable, by the time they reach it the game's already been decided? Every champ should have some sort of spike to make them useful. Granted, Vayne is a good pick versus sustained damage and mostly tanks, but she's struggling versus just about every ADC whose name isn't Sivir. (Not a Vayne rant, btw. Just an example of an late game champ that isn't given her time to shine at any point in the game)