Because he has been playing well. His 3 point shot hasnt been going in but we all know he is a good shooter, thats not a concern. But the rest of his game has been good. His defense has been good and he is doing everything else well.Not sure why Niang keeps getting minutes
For the record he is by far our best net rating player. He has both the highest offensive rating and lowest defensive rating. I am not sure why people are trashing on him this year. For a small role player he is playing incredible. All of that with his most valuable feature of shooting being off. But all shooters have ups and downs with that.

Players Advanced | Stats | NBA.com
A table featuring advanced information for each player in the league based on selected filters.