Queuing rules

So I've got a question. What is the point of restricting which MMR levels you can queue with when you can just make a new account anyway? Just played a game against a group of 4 people with one rando. My team? all solos. Then turns out one of them is a streamer. Diamond smurf according to in game chat and stream title. At least one other person is also smurfing because in game they said they needed to make a new account to play with friends. But I imagine the other two were also smurfing too but I could be wrong about them. Game before that I was against a blatant Riven smurf. Riven in the name, Level 20, owns Riven, owns Arcade Riven skin, practically doesn't miss any cs until about 13 or 14 minutes in when she decides to start farming champions instead. Learned a whole lot that game. /s

I looked a bit and this whole "to play with friends" excuse seems to be not that uncommon. So they're purposefully bypassing a mechanic in the game that prevents games from being severely outmatched, and that's a go to excuse? Why have the league separation mechanic then if it does nothing and isn't enforced? I dunno maybe it gets better at level 30 but my god I cannot play this game for more than a couple matches because every game is just a stomp one way or another and it's basically me sitting in the backseat waiting to see which team has the better smurfs on it. Doesn't even seem worth it to play...