There all are good points, howeverwe are just talking about one of the few most played game on BGA, so it could work to make some kind of exception for that game & it seems to me to be relevant to mate these 2 ratings system, while it seems quite irrelevant to me for many games.
For 6 nimmt, the game is reversed if you choose professional or normal settings, strategies are quite opposite, so for this reason it would be meaningfull to make two ratings for this game.
For 6 nimmt, the game is reversed if you choose professional or normal settings, strategies are quite opposite, so for this reason it would be meaningfull to make two ratings for this game.