What happened to "Worst teammates not determining games"?

Its not really either of those Games are typically decided by who played the most broken comp aswell as if they have decent experience on said champions vs -> Your team that decides to "Well its a counterpick to the enemy pick"

"bUt ITs A tEAmGaMe hUrR DuRR"

{quoted}

Your games are still being determined by your worst teammates.

Or your losses are due to the enemy team having the best player...