This to me is like arguing that a QB, who has the ability to both pass and be a threat on the run, shouldn't ever leave the pocket because he's a great passer and he should just stick with what he's really good at. Because everybody knows that there's no such thing as complementary skills.
These must be the same people who loved Rondo because he was really good at passing and hey, passing is what a point guard is for, right? No sense in worrying about any other part of his game.
The great benefit of having a superstar on your team is that they can do tons of different things well and make it so everybody else on the team has to do less in order to succeed.
Why would you intentionally limit your star if he has the ability to do pretty much anything he wants on the floor?
This is different than saying AD should have the green light to just launch from the perimeter. But that's not the situation. All we've heard is that they're having AD practice his outside shot, presumably so he can punish opponents for ever leaving him even if he's out on the perimeter.
Obviously, AD should play to his strengths. But the ability to shoot from outside opens up opportunities to do the things he's really good at. If the opponent has to worry about AD popping out to the three point line on a pick and roll instead of rolling to the rim, that opens up more possibilities for AD and his teammates.
Not to mention, AD has the ball-handling and speed to viciously attack closeouts, so if he catches the ball on the three point line and the opponent has to rush out to potentially contest, he can attack and get an open lane to the basket.
There's really no downside unless AD falls in love with the outside shot like Josh Smith. I don't see that happening.
LeBron was once a poor outside shooter. He's always been a phenomenal finisher in the paint. Was it bad for LeBron's game that he developed an outside shot?
Going back to my earlier point: which would you rather have, a superstar who's really good at playing on the inside, a superstar who's really good at playing on the perimeter, or a superstar who's really good EVERYWHERE?