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If I read you right, you are talking about a "matchup adjusted" rating that, e.g. for hitters factors in the quality of pitchers faced (and vice versa). I have been wanting to see something like that for a while now. Quantify who is getting it done vs the top opponents (ie, playoff conditions), vs feasting on scrubs. I think it would fill in some blind spots from the one size fits all WAR type stats.
So...yes please!