The Diamondbacks of the last several seasons have not had many young players to promote to the major league roster, and many of the ones they did haven’t gained significant playing time or created a lot of value. This is especially true on the position player side of things.
A big reason for this is because when Mike Hazen took over as GM during the 2016-17 offseason the farm system was viewed as one of the weakest in the league. There were very few prospects ready to promote to the majors and contribute in a meaningful way.