Originally posted by
Awsmninja
Thanks for the link, I never saw that AMA so the answer they gave was really helpful!
Although I now understand the advantages of a hidden MMR for algorithm tweaks and to prevent reverse engineering, I still don't understand why the previous "swingyness" being a reason to have a disconnect between your rank and MMR. If you ranked up/down too fast when the rank was more tied to the MMR, why not just change the MMR system so that it's less affected by singular games?
Although I definitely don't have the full picture since I'm not a Riot employee, from how they explained it in the AMA, and how people are reacting to the rank/MMR disconnect, I feel like keeping the rank more closely tied to MMR, but having MMR change less from a single game would solve a lot of the gripes many have with the current ranking system. The amount of rating you gain/lose would essentially be the same, but people couldn't complain anymore about how they're losing too much rating or playing with people with much higher ranks than them.
Unfortunately most Elo-like systems require 1000+ games to actually know your true rank. That's also in an environment where the rules may stay static, no new content(like maps), very static rules - essentially chess.
Because we have to take a more proactive approach, your MMR is still pretty in flux until you hit the 50-100 game mark. We saw lots of feedback that "Two bad games demoted me twice!" alternatively if someone popped-off they may have promoted into a rank they may not deserve if it was early in their confidence/mmr testing.
So this new system lets us test your MMR, get more confident in it, and converge you to the rank you belong in over time. The system also allows to create a very strict set of rules, for gains and losses, using ranked rating. In an MMR system, even if we made your MMR visible, every match would be vastly different in gains/losses. One match you may gain next to nothing, where the next you may gain a ton of MMR. Switching to ranked rating lets players clearly know about how many wins it should take to rank up.
It also lets us do things like punishments, or rewards, without altering your MMR. Lets say we want to punish players who afk, by deducting ranked rating. If we do that we are no longer effecting your MMR, potentially creating issues with match health, but we have a way to punish you for bad behavior. Alternatively if we ever wanted to create a system to refund games for X, Y, Z, reason we now can give you ranked rating without being concerned about MMR. If we touch your MMR, especially after you played a match, for a punishment or reward it would effect everyone you come in contact with where as Ranked Rating is purely yours.
Hope that helps!