This is exactly what happens. I’ve climbed from 1900-2000 to plat, as high as 2900 over 100 times at least throughout my experience and it’s always going up or down. There is almost never a point where you settle at a rank and have good games. Literally that is all the system needs to do for people to not believe “conspiracies.” But instead, I am always going up 200-1000 sr or dropping that much. Pretty much all at once. If not a 20+ game loss streak it’s at least 90% losses over a 30+ game stretch. Then when the system finally starts giving you a couple good teams, and you obviously destroy because your like 500 sr below your rank so now the system starts to give you wins where you can go afk and still win.
I’m fairly certain this only happens to people who can carry super hard when they are below their sr and have the right team around them. The worse you are for your rank, you just kinda get carried and stay around the same rank so they think the system is fine. This is why there is a disagreement between players. It’s the ones that solo Q and are decent for their rank that have wild swings because of the MMR system and trying to create “fair matches” then changing it’s mind about you drastically due to good or bad performances. Even after 1000 games, the system wants to keep guessing your MMR and changes it’s opinion constantly based on how you do with good and bad teammates. Like how much more simple could it be? If you can do pretty good with good teammates, it doesn’t mean you need to get dropped to silver because you can’t carry the same way in an impossible situation.
All people want is consistency and yet the system only cares about skewing matches to get people where the system thinks they belong.