The one thing that has not been mentioned yet and that would diminish his offensive value even if he found a way to make decisions way faster is his shot… He has the shot of a 6 year old. So defenses, especially on the PP really do not have to worry about his shot at all and could strictly focus on being in passing lanes.
That he could not improve his shot puzzles me way more than his inability to sort out the decision making problem (which may just be unsolvable… if your brain works at a certain speed, there is only so much you can do).
Edit: while it’s always tough to judge from the outside, I haven’t seen or heard a hint towards any attitude problems.