One thing I love about basketball is that there are a million different ways to be effective on the court. I do think it's fair to be a bit concerned that Tatum hasn't improved more. However, each of us has particular ideas on how he should do it. As long as he finds a way, somehow, I don't care how he does it.
If you had asked me, I'd have suggested that he gain 10 lbs, and focus improvement on finishing with his left hand and working on drawing fouls. It appears that his main concern was to focus on reducing mid range shots from his shot selection.
My guess is that if the team improves the pace some, and Tatum does nothing more than take a couple of more shots and matches the kind of shooting efficiency he showed as a rookie, we'll all like the very young 20 ppg scorer we have. Those are some fairly minor adjustments.