Here's the thing about Harry: we've seen a successful version of a player with his traits. Several of them in fact.
Look at Dez Bryant. He was never a technician as a route runner and didn't separate with speed. But he was extremely aggressive - he used his size to box out corners and was very good at attacking the ball. He bullied corners all over the field, so he didn't NEED separation on every play to be a high percentage target. And of course he killed it in the red zone.
Harry DOES NONE OF THESE THINGS. He has all the same physical traits and limitations as Bryant, but plays SOFT. He gets bulled by 5'10" 180lb corners in spite of being a jacked 6'3" 230lbs.
Young Dez Bryant would run the wrong route and get confused. He needed to improve things to be the really good starter he was for a while there. But you ALWAYS saw the aggression, the violent style of play that type of receiver has to have to become a major asset for a team. But for Harry that's been the exception, not the rule.