I don't. But my argument for the inaccuracy of dWAR is that JBJ has more defensive value than a replacement player every day. Or even that JBJ has more value to a team than that 1/2 run per season.
There are so many things about dWAR that are bogus. For example, when we talk about all three of our outfielders the discussion goes to 1) it's possible that Beni's dWAR is undervalued because he plays LF in Fenway, 2) JBJ's dWAR is undervalued because he plays next to Betts in RF which prevents him from having to get to balls hit to RC, and 3) Betts' dWAR is overvalued in comparison to other RF'ers because there's more ground to cover in RF of Fenway than (nearly?) any other park.
And that's just the Red Sox. For example, is Judge's dWAR negatively affected by his playing RF in the bandbox now called Yankee Stadium? Or is the park effect exclusive to Fenway?
With all the flaws and questions about dWAR I find it hard to believe that anyone would try to defend it. It's the triumph of stats over logic.