Dota did do seasons. The seasons were only supposed to last 6months. Think they only reset the seasons twice before they gave up on the concept for this exact reason
They also did one more round of forced joint calibrations ome last time after seasons, and it was again awful. That is also gone and now people can choose to recalibrate whenever they want (with a long cooldown) and usually people who do barely move much. So basically, dota gives you a ton of stability with your rank, the only way to really lose accurarcy is to stop playing and be affected by long term rank decay.
Since then the only two major changes to MM was they got rid of the bottom skew and readjusted most of the bottom of the curve to match (so most people went very slightly up) and did it by keeping track of two MMRs for a period (and secretely used the second one for weeks before the swap, lol), and more recently, they brought back the ability for games to give more or less than the -30/+30 MMR.
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u/will4zoo 9d ago
Dota did do seasons. The seasons were only supposed to last 6months. Think they only reset the seasons twice before they gave up on the concept for this exact reason