Brady's never had a good deep ball. He had only 1 successful season throwing deep and that was the 18-1 year when Moss was unstoppable and could adjust to everything thrown his way. He's made a career on elite short-intermediate accuracy and going through his reads in a system that fits that skill set perfectly.
Maybe he's not the greatest deep ball thrower, but he's still good.
I'm not sure where you got the idea that Cam is definitely better at it..Maybe you could show me some numbers or something that would support that statement and I would change my opinion, but I have no reason to believe that based off of what I've seen.
Brady is one of (in my opinion, the greatest) QBs of all time. You could make a better argument by saying Brady has gotten by without a great deep ball, but when you say Cam is definitely better..its hard to back up those statements.