Is League Of Legend Really is RNG based game?

I know people say League of Legend is a team game, similar to a sports. But it’s the exact opposite, in rank solo/duo, this game put you with 4 random teammates that you probably has never played with before, to team up and expecting a good team work. Of course you can still duo, but sometime you still can’t carry even thought you and your duo partner are carrying. This game is really independent skill based, if one side players are good, they might pull off some good team play. But look at the reality, most of the player base who’s below Diamond 2 are incapable of doing that, managing micro and macro at same time. So if you get put together with 4 other bad player, no matter how good you are, your chance of winning has going down significantly. And some people doesn’t belong to the rank they have, lots of them abuse the meta and simply winning lane because the opposing laner is bad mechanically and sometime they’re autofilled. This whole system just doesn’t seems fair to some players; it’s basically the team with better luck of getting decent player wins. It just feels like a RNG based but use team work as excuse to attract more players who believe in teamwork because they play rank flex. But remember in rank solo/duo is where player test out their true skill is individually.