Maybe it's not Turner's fault. "Turner finished the night with just two points, four boards, and two dimes on four shot attempts in 22 minutes, while the Lillard-McCollum tandem took 43 shots combined."
Could be Turner is playing with ball hogs who are shooting well. Plus, the team is winning. So, the coach lets them do their thing. Once they start losing, the coach will find a way to work him into the system. Or, he'll get to shine when either Lillard or McCollum get injured. I wouldn't be losing too much sleep if someone paid me $18 million/year to score 4 points a game.