I think if players play meta champions then it's easier for players to carry. However, if players play off-meta champions where these champions are already not in a very good state, then carrying the whole team becomes a problem, and it's not a you problem, but a champion/team is bad/team comp problem. I mean if you're losing on meta champions though, then it's a you problem probably and you deserve the rank you're in. People play off-meta champs though to have fun and enjoy themselves, and I think the game has been a bit more unforgiving lately towards off-meta. Just my opinion on the matter.
There is also the problem where in lower elos, it's harder to coordinate your team. You also have to consider it's hard to coordinate your team to fight a 4/5 man turret siege. Players will be slow to react and have bad map awareness in lower elos. I think this is where a lot of the problems stem where people say they lose because of their team. If you're playing an off-meta champ, which is not in a good spot still, it'll be hard to carry a team like that probably.