Is it just me or there are some champions that can't be beat?

So i played a game recently against a Nasus as Olaf. I do know that nasus did get buffed and olaf nerfed, but my point is that you poke him he heals back he scales extremely well and late game doesnt give a shit about you. Up to a 90% slow which increases over the duraion, his ultimate gives him extra tank stats. Feels impossible to beat early mid and late. The thing where he could be beat early game is not existent anymore. I played a normal game with him, hit 500 stacks at 25 minutes. Trynd gets a kill or two snowballs the lane split pushes the whole game. Tahm Kench top lane with full hp does at least 500 dmg on hit, Yi is Yi, veigar is cancer, Fizz is cancer. Tanks in lower elo are gods since its pretty hard to coordinate in low elo solo q and end the game fast to stop these champs that scale in the late game. It feels really frustrating to play against some of them. My main focus of this post is Nasus as i said. I have experienced him as and against. Frustrating and hard to play at all stage of games.