>>30248089Because you're a whiny little bitch who deserves nothing more than it.
EXP Scaling brings difficulty to the main story. Sure, to most experienced veterans who are avoiding the shitty Alolan mons for some reason have no issue, but to the casual player/child it's a decent challenge. The EXP Scaling was added with this in mind, so you can't mindlessly overlevel your Pokemon to steamroll 100% of the game.
On the other hand, you have plenty of options to powerlevel your Pokemon. The Elite Four still give decent EXP until the high 70s, and you can stack Restaurants in Festival Plaza for more powerleveling from there on.
You don't need level 100s unless you're a lazy, casual fuck who can't into breeding.