Time to correct the myth that typing something to a teammate makes them "play worse"
Let's all have the honest discussion riot refused to let you have on why you lose games. you lose because you play worse, not because someone types omg our jungle sucks as your jungler reaches 0/5/1 at 15 minutes never ganking or being counter jungled. Ok so please stop the utter nonsense about typing he is playing bad is the REASON HE IS BAD.
Then lets all have that real talk about what makes your team more likely to lose. When you pick kindred jungle never gank, build all offense and get out dmg by the enemy support THAT MAKES YOUR TEAM LOSE. When you are mid and you go 0/7/1 at 17 minutes THAT MAKES YOUR TEAM PLAY WORSE. So again lets stop pretending some person typing why you suck so much is the reason you are 0/8/0 and lets stop pretending that line of text is what makes your team more likely to lose when the reality is and the FACT is the guy who is 0/8/0 is what makes your team more likely to lose, and more likely to play bad.
So please riot if you really want to improve the quality of your game offer more tips like "if you fall behind in your lane play safe, players who lose lane badly are 87% more likely to cause their team to lose" and less "players who point out their teammate is doing terrible are more likely to lose 17%".