At some point results are important, and Woodruff’s results before his injury were not what a team expects and needs from an ace pitcher, both from the standpoint of preventing runs and covering innings to protect the bullpen.
In his first 8 starts he had only 2 quality starts, which IMHO are a pretty low standard for an ace pitcher. In several starts, he was taking 90 or more pitches just to get through 5 innings, even when he wasn’t giving up a lot of runs.