One sided games prove that the matchmaking is bad?

false. there's more factors to one sided games than matchmaking. you can put players with the exact same mmr in a game and still get a stomp. say for example, there's a diamond one trick but his champion is banned. without his champion, he plays around plat level at best and he's absolutely destroyed in lane. there's only 3 lanes and you're guaranteed to lose that one.

now to take this further. even if the other players were somehow equals, someone has to lose lane. the other two lanes are 50/50, so the team with the diamond one trick is likely to lose 2 lanes out of 3 and also likelier to lose all 3 lanes. matchups, early game cheese, and tilt also affect this.

One sided games alone don’t prove it. But the sheer number of one sided games we have proves it.

I haven’t had a legitimately “close game” in the entirety of season 9. I’m not even memeing here.

Matchmaking is broken, snowballing is broken, runes are broken and most of all moral is broken in all players that even get 5gold behind

1st of all. Normal matches are not designed to be balanced games. So, you would need to add the word RANKED to your title.