I think it's perfectly fine to point out Reke isn't a good mid range jump shooter or a good shooter off the dribble for that matter. And I'm in complete agreement he needs to continue working on that part of his game and given the improvements he made last year(set shot much better and form off the dribble was much better although his %'s weren't) I think at 23/24 it's fair to expect him to make some improvement there.
What I disagree with is that somehow tells how valuable Reke is or a mid range jumper is needed or there just won't be any space to operate. Space comes from surrounding Reke/Cuz with shooters along with correct movement. How many times last year did we have two players running to or occupying the same spot? Far too often and that has little to do with shooting. Cuz being able to operate out of the high post would make spacing even easier for a good coach as the defender can't sag off him clearing lanes to the hoop which Smart never took advantage of. Same thing Rick used to do with Webb/Vlade out high. It's not like Peja/Bibby were getting backdoors off their athleticism, it was spacing. Same thing Pop does with Duncan out high, opening lanes for Parker/Green/Leonard backdoor/baseline.
Reke with the ball in a good system likely is at or near 20/5/5 and doing it more efficiently than as a rookie with improved vision and an improved understanding of where to get guys the ball when defenses collapse. That's near or at All Star level, depending on the supporting cast as you're rarely an All Star if losing. A great mid range jumper isn't needed for that. All he needs is enough of a jumper to keep the defense honest, and we saw that the 2nd half of the season, teams didn't play off him as much. The spot up 3 is the most important shot for spacing in basketball, where 58% of his FG's from 20-24ft were assisted, which is a reverse from his first three years when he was better unassisted from three. That shows not only improvement, but improvement as it relates to spacing and fitting into a system, where spacing relies on the ability of your guards/wings to be able to hit a spot up 3 off a kick out/double.
So while I agree he should improve his mid range jumper, it's in no way vital and if he does add one it turns him from a near All Star level player to probably a top 3-5 SG in this league, especially with the best SG's being on their last legs right now.