i think your rank elo/mmr should be reflected in your normal game match ups. why allow a plat/diamond player to be matched vs silver and bronze. how is that fair match making. 90% of the time the bronze and silver lvl players have zero chance of wining the game, ideally riot wants the game matches to give each team an equal chance of winning. no way it can be perfect but some where in the % of 42-58 swing would be acceptable.
they already match premade dou's and premade groups vs a higher base mmr due to the coordination , chat, ect. that is the whole bitch about dynamic queue that a group is more likely to be able to coordinate better then 5 randoms.
by allowing high elo/mmr ranked players to queue against lower elo/mmr it makes an unfair, unfun environment which could create a toxic game. people getting upset, mad, raging and flaming if not afking due to getting smashed and people are like OMG look urgot is feeding top 0-5 bronze urgot vs plat 2 X champ.
that player is most likely just getting beat. but we dont see it that way.
but this poster has showed links of games where he was match vs 3 plats. so it is an issue. its kinda like letting a division 1 college play vs anytown usa freshman football team.