His feel is limited but...and this is my problem with both Sarr and Salaun (though Sarr should be decent)....players like Giannis, KD, or McGrady
already had shot creation and ball handling capability at 18/19 years old.
Speaking as someone who wanted Giannis for Portland, yes, it isn't just athleticism you look at in a star wing/forward. It is how fluid and smooth they are in relation to their ball handling and shot creation, all in addition to some level of efficiency as a scorer.
Let's take a look at what Mike Schmitz wrote regarding Giannis, back in the day:
https://www.draftexpress.com/article/NBA-Draft-Prospect-of-the-Week-Giannis-Adetokunbo-4090/
Salaun doesn't have the above capabilities. It's possible that, with hard work, he can learn to handle the ball better but that's rare and it's even more rare in the context of being able to move and angle your body correctly to blow past defenders, even if you develop handles. Again, that's the fluidity and smoothness aspect.
Essentially, most players are already set by the time they're adults. It's just a matter of efficiency in some aspect so that they can fall back on that, in case the newer parts of their game fail. Thus, Giannis was 60-67% from 2 while being a 70+% FT shooter due to being able to attack in transition, make appropriate cuts, and blow past defenders. His hands were large and useful, active and capable of palming the ball.
Salaun? He can't handle the ball, his playmaking is limited as a result, his FG% isn't great. I'm not going to write him off but it's very likely he becomes something like Cam Johnson, as a higher end projection.
Otherwise, Giannis was always athletic, fluid, and a good ball handler with some playmaking potential from the get go. McGrady and KD? Same thing. In McGrady's case, it was a matter of finding minutes and tightening up his already existent skillset.