Hitting a wall

I don’t understand why he removes Kamara and Hill from the field so much. Even plays designed for other players, I’d like to see them on the field more drawing attention.
I don’t get it either. Kamara is never given the opportunity to get in a rhythm because they keep taking him out. I get wanting to keep him healthy but at what cost? Doesnt matter if he’s healthy and rested at the end of the year if we miss the playoffs.