Yi is right a bit. Why? The last like 5 of the scenarios you describe are me wondering why the premades never go on a lane, and never seem to teach each other.
A guy in his Level 40s brings in his noob friend and then let that friend lose us the game. They are not on a lane, I do not see the noob friend - a jungler - ganking his friends lane to get some sort of advice of DOs and DON'Ts via voice chat, he has 0 vision score and after noting that, he still does not place wards the whole game. Nothing. Literally retarded noob beginner trolls. I am so very sick of that shit it's unbelievable. Being new and a total spazz are to different things. I can't remember in the past couple of weeks when a feeder "beginner" was any sort of "Humble", and asked and accepted advice. It's just trash and literally the "you lose" card, because the noobs premade friend can't nearly compensate for the friends suckage.
I should really collect screenshots to confront people like OP with the vast majority of toxic beginners and then he might understand where Yi is coming from.
It's just dead weight. And then? The low level guy is "Repport far toxicity" (being 0/11/2 like that Nocturne last week) and the friend is "STFU you toxic **** she is new". It was a guy playing with her girlfriend, both toxic as hell, and literally just spazzing out. Fuck these "new players" in my game when we are all Level 50+ and suddenly this retarded "matchmaking" gets me some feedertard and his friend in the game. That massively tilts you.
EDIT: I played bot games for ages to avoid that. It's just courtesy imo.
Also, where is Vel Koz' friend? To teach him about his outdated beginner/starter summoner skills? Or the wrong keystones/runes? The game even puts you a tooltip that you can (and have to) freely change them. What more can we or the game do when the noob player does not react to a huge ass speech bubble and a flashing button in the champ select?
I feel like you were the newbies friend. It's always like that.