One issue is that once you find your level, Elo should keep you around a 50/50 win rate. So it doesn’t feel like you’re making progress or improving even if in

One issue is that once you find your level, Elo should keep you around a 50/50 win rate. So it doesn’t feel like you’re making progress or improving even if in a real sense you are. It’s also a bad fit for team games. But ranking individual contribution to a team is hard. Even for something like the NBA where there’s obviously a ton of incentive to do this, statistical methods rely on a large sample size and often need to be taken with a grain of salt.