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I just think the boundaries of "diminishing returns" for an outfield defense is expressed as...the boundaries of actual measured defensive values in the outfield.  We've actually measured - every year, for the most part - outfields that impact the scoring by 40 runs to either side.  We've observed teams adding legitimate +20 run defensive outfielders to the fold and actually gaining those 20 runs.

If I were saying that it was possible for the Mariners to add ten wins on defense or more, you might have a beef...I'm saying they happen to be an extreme case, moving the needle from as bad as it can realistically get (without playing three people way out of position) to as good as it can realistically get (without the players stealing each others' balls so much that no further gains are possible), and that this could be 8 wins in value.