I realize that the off season is not complete and that you take projections with a grain of salt, but on paper, Fangraphs currently has the Red Sox with the 3rd best offense in baseball, behind the Astros and the Yankees.
The Astros are projected to score 865 runs, the Yankees are projected to score 837.5 runs, and the Red Sox are projected to score 824.6 runs.
Despite the Yankees adding Stanton, they are projected to score fewer runs than they did last year. And despite the Red Sox being status quo so far, we are projected to score more runs than last year. It looks like the stat geeks believe there will be some regression from both teams, the Yankees in the negative direction and the Sox in the positive direction.
IMO, we don't need that big bat as much as most people think we do.