What a crock. His DWAR is -0.3, which means that he will cost the Sox 1/3 of a one win more than the average MLB thirdbaseman.
The Sox have always gone for bats first and gloves/arms a distant second, including at SS and CF. And that's why Devers took over at 3b for the Sox in 2018 despite a DWAR of -0.9. His overall WAR's have been 1.3 (2017, 58 games), 0.0 (2018), 5.3, 0.4 (2020), 3.5, 4.4, and 3.0. That means that overall he has been a net plus at 3b, more so than many of predecessors.
Remember the 2013 WS champs Sox? Middlebrooks at 3d base had a WAR of -0.1. Youk, WAR of 4.3 in 2007, was the Sox last productive thirdbaseman (on a Sox WS team), and they moved him to 1B.