I get what you're saying, but where is the "low elo" line drawn? Someone with 10 wins in Gold IV is probably a smurf and going to crush anyone still sitting in GV with 600 wins.
I remember back in Season 4, I got matched with an extremely unskilled player who picked Sejuani top and got destroyed. At the time, I was Silver II, and they were Silver I. After the game, I added them and asked if they were new to ranked. Sure enough, they were a fresh level 30 who had jumped into ranked and got a lucky carry to 9-1 placements. They hadn't won a single game since being placed.
I think a big part of it is that new players are able to place too high too easily. There shouldn't be non-smurfs placing Silver I on their first ranked season in most cases. Honestly, I know it's blasphemy, but I almost wish score was considered during your first season placements. Obviously, the player in question had been carried and didn't do particularly well in any of their games. Fast forward a year and a half, they're currently sitting in Bronze V, and I'm not kidding.
In placements, if you're on your first season and are rocking a sick score of 1/9/2 with 34 CS, no towers destroyed, and 3K damage to champions every game, that should drag your wins down a bit.
I should add, yeah this sucked for my team, but it also sucked for that player. Who wants to get slapped around by people who outclass them that hard for a half hour? It's bad because it hurts the outmatched player and their team, while giving what I like to call "false MMR" to the enemy team. Yeah, players like that end up where they're supposed to be eventually, but they ruin a lot of games in the process.