It's glad to see the old technique is used for new models.
You may also learn from 7.33 dota update which uses a new ranking algorithm called Glicko.
You may also learn from 7.33 dota update which uses a new ranking algorithm called Glicko.
Valve listed some reason for making the change.
One is a rating system named after the creator, Arpad Elo. See https://en.wikipedia.org/wiki/Elo_rating_system
The other is a rock band that was formed in 1970. See https://en.wikipedia.org/wiki/Electric_Light_Orchestra