1. He doesnt draw fouls at a high rate, or even a medium rate.Mitchell is our best offensive player. What are his weaknesses? I saw you mention his inability to shoot off the dribble. But that can be improved with time. Mitchell is a good passer, and he draws a ton of defensive attention, allowing him to create good opportunities for others. That is one of his biggest strengths. What weaknesses would be magnified if he played the point? What strengths would be diminished.
2. He doesnt shoot well off the dribble (or off the catch currently, but I think that's more sample size)
3. He is an incredible passer, at times, but he also gets tunnel vision and goes for the spectacular play when a better simple play is available
4. His natural instinct is scoring/shoot first. If you give him the ball more he is going to shoot more, then he is going to overthink if he is shooting too much and not getting others involved. The minutia of the position will likely interfere with his best traits as a player.
5. More responsibility = more fatigue, both physical and mental, when we have to rely on him in crunch time for self-creation isnt ideal.