Can we please add a DotA-eque "It is now OK to leave" if someone AFK's in normals?

Ya, playing 4v5's is pretty fun. imo the ONLY reason you aren't having fun is because you want a WIN.

False assumption.

I (and I think most people here) find competitive games fun. Sure it is frustrating to lose and people want to win, but I find winning one-sided stompfests to be far more boring than losing a closely matched game. So no, its not because people just want to WIN. I learn so much in close games that I lose, than in stompfests where I win or lose and 4v5's are almost always stompfests and a waste of everyones time.

I've had some competitive 4v5 games which I've had fun in, regardless of if I won or lost, but that is rare and only happens if you are lucky enough that the matchmaker stacked one team so that they are much stronger than the other team that they can still win even one player down. The overwhelming majority of 4v5 games are not competitive at all and for me that is NOT fun.

4v5's are not good practice. Unless the opponent is markedly worse a 4v5 will result in you getting steamrolled even if you play well. Getting steamrolled is neither fun nor a good learning experience. Losing a match that starts out equally matched is a very different thing to being at a huge disadvantage off the bat and relying on your opponent being a lot worse than you to have a shot.

This is wrong. Given similar skill level that the normal and ranked matchmaking is supposed to find, 4v5s are not fun for the winning nor losing side. Have you ever had fun winning as a team with more people? Probably not. Have you ever had fun on the losing side because of a DC? probably not. Overall it's a game that many people just don't enjoy.

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I've won 4v5s and lost to 5v4s enough to know that while I really wish we could just end it and go home, while I'm still in the game, I'm going to try just as hard as I would anytime else, because that effort is the only thing that wins games, not numbers.

It's not really about winning or losing for me in a normal game, I care more about whether I'm having fun. And win or lose, 4v5 is very rarely fun for me. I would much rather cut my losses and let them push as 5 mid to end the game in 4 minutes, saving 16+ minutes of my time. But I'm not allowed to do that because there's always 1 person who wants to play from this crazy deficit, for some reason completely unknown to me, and if I don't actually try then I'll get reported.

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I used to play a lot of Dota 2 and it wasnt a common occurence.

I'm referring to lower tier players. I created a smurf to play with my friend and it happened more than a few times.

How does removing /all prevent that? You don't even need to use /all to ruin someone's fun so long as you're on the same team, and in the proposed situation of a 4-person group with an odd man out, it's quite likely that the 4 will spend the entire game verbally abusing the poor schmuck who got saddled with the peanut gallery.

Hello hater. Riot implemented an even better tool which was even harder work and makes your suggestion absolutely redundant. Everone can just choose to disable All-chat entirely completely on their own, while others can still use it in the respective game, how cool is that! And even better, you only need to change it one time in your system and you are NEVER bothered again with both ALL-chat messages from your or the enemy team! Wow! Check today!