This idea that the game is nothing but button mashing and reflexes now is a blatant lie
Proper warding is still integral to the game. Knowing your and your enemies' powerspikes is integral to the game. Itemizing properly is integral to the game. Positioning is still integral to the game. Proper champ picks are still integral to the game. Good mechanics are still integral to the game. Good decision making is still integral to the game.
If you get deleted by an enemy champion and the only thing you can think of that went wrong is "game balance has gone to shit" then you're a shit player.
If you think that there is no skill expression involved anymore outside of reaction times and button mashing, you should face some actually good players.
It depresses me that this internet forum is rapidly turning into the generic "this game sucks now" circlejerk where people propagate lies just to reinforce their feelings.