Don't necessarily agree with the latter part of your point, but I do agree with getting rid of the rocket catching. But,
Both Clayton and Mason are not even 6'0 but in these pics, they boxed out the defenders and fought for the football. Clayton caught his, Mason came up short. I think what they need to do is change the passing mechanic. On the Clayton pass the ball is underthrown so he fights to get in position coming back too it. But he could not turn on a dime he had to pivot and come back. On the Mason pass, he mistimed the jump and it caused him to drop it.
With all receivers, your success should depend on what type of pass you made, under/over throw and what type of control you have over the WR at the time and the ratings. If you cannot turn on a dime then you cannot have full control of the guy. Some elite guys should make catches when you are not in complete control, but not always. Some guys should not make catches at all unless you are in complete control. They gotta get rid of the rocket catching and jetpacking. Control is the key here. But control needs to be situated within parameters of physics.