Why does our 5'6" receiver not do more comeback routes?

There's a reason the NFL doesn't have any 5'6 receivers. Even when Harris is open his catching radius is so small it takes a perfect throw to get it to him. NFL CBs are too good of athletes that window doesn't stay open long enough.

Similar (but different because it's a deep ball vs comeback route) to Hills terrible deep ball throw to Harris. You just can't afford to be late whatsoever. NFL CBs are just too good and windows don't stay open long, especially when your receiver is 5'6 and the defending CB has a significantly larger catch radius.