Because some players need to be not playing on your bench in case you have a bunch of injuries?
We did have a bunch of injuries. Diarra could barely move for a few weeks and Mahaney was pretty much riding the bench. Nowell still didn’t get minutes. Same for McNeeley and Karaban. Both missed several games and Abraham didn’t sniff the court. Depth is overrated to an extent anyway. With the exception of very few, the best teams play no more than 7-8 guys.