Depth is very important. We had 20 pitchers contribute positive WAR last season, more than many playoff teams, including the Yankees and Brewers. On the offensive side, Tauchman, Bethancourt, Cooper, Bote, etc were all positive contributors. They certainly gave too many PAs to Mastrobuoni and Madrigal, and those PAs going to better players will help, no argument there.
Like many others, I would just like to see an addition to the top of the rotation (which also pushes quality arms down into depth roles).