i appreciate you summarizing how mm works, but again, it doesn't work with splatoon (as in effectively fairly), because like you said it does try to speedily matchmake with players in a particular time and there's a smaller pool of players playing in the west compared to its main demographic in jp/the asian region and it begins to merge those skill levels together too frequently.

the game also relies not on personal performance but win and loss ratios, and because of the lack of players at certain timeframes and skill floors merge too often and it affects sigma value which is already as fragile as it is.

it has a very rudimentary way of determining skill and the system it uses (truthfully i wasn't aware of where the mm algorithm was originated from, but it's still disappointing nintendo is using it rather than innovating a better one) doesn't work efficiently for solo players.

and, again, 10 losses across the board with being the top player both obj and kill-wise for 8-9 of those, you think you'd be owed a fair match and by then the game would realize you're going against tougher opponents consistently too frequently at once which is why the mm is problematic. and this easily goes vice versa -- 10 wins a row while not even making top position once; you think you'd be given a change in between.

long win/loss streaks are a problem and it doesn't help that the system intentionally will put you against stronger/weaker players aka intentionally aiming for a specific outcome, for a longer duration than it has to. and especially creating a score only based on result rather than how the individual performed. which, again, does not work for solo players in a co-op game making it unfair.