The expectation of how hard one can solo carry to move up singular divisions is no longer realistic
I remember back when I started the game, solo carrying was 100% exactly what it meant, and was infinitely more possible than now. However, multiple changes over the course of the game since then have made solo carrying a lot harder (split pushers being nerfed, solo vision access being severely limited, general damage creep making teamfights shorter and more volatile), now this isn't bad in and of itself - team game after all - however in conjunction with the whole: "Her's some crappy teammates, 1v9 and you can have Silver 1" is likely going to gate most players who are below Plat (maybe even higher).
I have never reached Plat, however I have been called a smurf many a time, and I had a game recently on Azir in Silver 1, where the ACTUAL smurf Ezreal said to me: "You a Diamond smurf too?". That particular game him and I almost 2v9d. Almost. The enemy team was mostly plat and gold.
But simple fact is, when you are being matched with people who were specifically picked out to make the game harder for you, this meta doesn't leave much room for them to screw up, and I feel this is magnified in low elos (can't speak for higher elos - gold/silver trash remember), as people in lower elos for the most part don't understand how to play around a player (whoever the fed one is or carrying the teamfights), and have minimal macro focus and knowledge, constantly walking into ambushes and overextending without vision.
I understand the theory and reasoning behind handicapping as a "final test" (thought that still feels a bit bs when promos are a thing), but honestly I don't think this is fair. I don't pick meta (when I do it's a coincidence), and my mechanics are kinda garbage (so I basically have to 1 trick azir and talon), so even as late game 6 item Azir (rare), I really struggle in some of these games because I have to kill the tank, kill the carries, check their divers/assassins, track ults/spells, position borderline perfectly, and do all that before the enemy team cleans through my frontline.
Plat/diamond level or not, I'm not gonna carry a TF who walks into the enemy Kha when we all saw him heading that way 10 seconds earlier.
I'm totally fine with raising the level of my opponents OR gimping the level of my teammates, but doing both honestly just feels asinine.