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June 26, 2020 - New Feature
This improvement for now is only in the NBA Career leagues. If you create the leagues starting in 1984 or earlier you will come across the improved 1985 ratings. I'll be looking to expand coverage in the coming days.
The main benefit of this improvement is improved relative team strength. Previously, by incorporating season specific stats in player ratings it can inflate players on bad teams. Also, if there are a lot of good players on good teams they may not appear as good as they really are. So this latest change incorporates team synergy that leads to wins that maybe isn't as obvious just looking at stats for individual players.
So I think the coming combined career based ratings, season based ratings, and team based ratings should make results pretty accurate on a player level, a season level, and a team level across all years.