Isnt it too early to crush this guy just yet? He is extremely young still.
I don't understand why people keep saying this when some of his biggest problems don't get fixed with time.
Mental weakness: if a player has a focus issue, or mental approach issue, that's hard to adjust. Some players never adjust, and keep the same approach throughout their careers. Some guys have the lightbulb season with the aide of a certain mentor coach or player, but I don't see what just more time in the NBA will do to suddenly flip the switch in his mind. He needs to recognize what he's doing first before he can change it, and it doesn't seem like he fully understands how much he's limiting himself upstairs.
Court awareness: he seems blind to every defender except the one that is directly guarding him. He doesn't recognize double teams well, especially from the weak side. When you can't recognize defensive positions, how can you make smart decisions? Again, this is an aspect of the game which can't just be ironed out with time IMO.
Body control: fitness, conditioning, strength, etc can be developed. But coordination is possibly the most difficult. Again, some guys never develop it. JT is clumsy. His movements are often forced. His defensive troubles are partly due to this area, as are some of his foul troubles.
There are other issues, but these are some of the more outward issues that limit JT's effectiveness on the floor, and they happen to be issues that aren't quick fixes or can't be solved by just being in the NBA.