Does Alec have physical tools and skill... yes. Has he improved his jumper... yes. What does he have to work on then? Getting familiar and comfortable with the new offense. The fact that he is sitting there and studying, observing, and traveling with the team tells me he gets that and it will be better.
If Alec takes his 3 point shooting from this year and combines it with his finishing around the basket percentages from last year (which may have been inhibited by a shoulder injury) he is a pretty damn good player. He will be more decisive next year after watching things and seeing what works. That automatic split second is really important.
Also, he has pretty good length to allow the switching which has been so effective. He is a good on ball defender. He can now jump the passing lanes with Favs and Gobert behind him. It is going to be ugly next year for other teams and Alec will be a big part of that.
I also noticed last night we went with 4 wings and gobert at one point. I am salivating a bit thinking about a lineup of Exum, Burks, Hood, Hayward, and Gobert/Favors. It is good times in Jazz land... get you some Kool aid bros.