No, anecdotal experience is just anecdotal and COULD mean confirmation bias, but it doesn't automatically make it so. Also "I've been matched with stronger allies and enemies, and will continue to be until I hit around 50% and reach my actual skill level." You just said yourself where in fact the rigging is.. why do you have to be at 50% to be at your skill level? And since you're either put with or against players of lower/higher caliber, how isn't it that your teams could be the ones being put against harder teams?
I was in plat promos with a 60% win rate now I'm Gold 3 with a 48% win rate haha, am I now magically below the level I was playing at when I was Gold 1 playing with and beating Plat 3 players? How did I devolve so much, while retaining my average kda, cs, end-of-game ratings that I'm now losing to Gold 4 down to Silver 2? Oh must be that 2/11 I had in bot or the 0/4 in top, or maybe the 1/5 in jg. While I'm 3/1 in mid - although can't do much against the enemy bot lane 11/1.
Of the majority of games I've been playing as my win rate declined, as I constantly struggled to stay in G2, being demoted then promoted again from G3, my teams have been the lower mmr team in average, with several other players on losing streaks or negative win rates. I once had a game of my team average Silver 1 against a team average of Gold 2. How is that fair when I'm already on a losing spree?
This game is rigged, on 2 accounts I have now have an overall 20 game losing spree. 13 on one and 7 on this. Some of the games I played poorly cause I'm extremely tilted at this point, but most of the time it's afks, griefers and bad players. Matchmaking is a joke, this season is a joke. Ranked is a waste of fucking time. Lost my plat promos 3 times, guess I'm just not good enough huh, yea must be when all lanes feed.