Why? We all clearly saw how capable of a WR he can be with Winston, no? Look at it another way; where have all of Hardy's injuries come from? Kicks and punts. Has he actually gotten injured playing WR? The team realizes how valuable Hardy can be to the offense, so why risk him on punts? Just like KC took Hill off punts.
That narrative can be further enforced by looking at the return clips of Rashid. He obviously has some level or vision when it comes to returns. Could that not happen? Sure, but the math adds up.