No. Absolutely not.
If MMR and SR were reversed, then smurfing would be impossible, as the system does spot smurfs and tries to move them up the ranks quickly by giving them tons of SR when they win. After a couple of throw cycles, their MMR can be reliably set and then they will only get matches close to/at their true MMR. It will significantly curb smurfing, at the expense of “Ranks” that make players feel good (or bad, lol).
The SR/Rank System is a carrot, and they don’t want to get rid of it - even if the alternative is more balanced matches.
The issue is that the Smurfs can reliably throw matches to drop SR and put themselves in low rank games. Because of the SR System, MMR does not matter when the matches are created - only the SR matters, because the system will only match players within a specific SR range.
The SR/MMR balance only works when players are playing fairly, but you cannot reliably assume that to happen, and it doesn’t take a majority of players to completely ruin the game for others at lower ranks (by disrupting competitive integrity, which makes the game mode an overall joke).
Even if a smurf is destroying people, because he’s a masters player, his SR1250 account is never going to be put in Diamond or Masters games. SR limits that, so the system is forced to queue him up with and against Bronse and Silver players.
If SR weren’t a thing, then the system can detect the smurf, start moving them up during their win streaks, and barely/not move them down until they’re being matched consistently against players of their true MMR - which is based on much more than simply winning or losing matches.
The SR can be used to give the smurfs TONS of SR when they win, but the smurfs can always throw and lose purposely to suppress those gains and remain at a low rank. SR based on wins and losses are 100% exploitable. MMR is far less so.
Stopped reading at the above quote because, really, just no…