That's one thing that's been bizarre to me. It reads like for whatever reason Doncic at 19 playing in the second best league in the world has hit his cap. He is what he is.
But then there's everyone else who has superstar potential.
It's his athletic limitations. Hard to overlook it despite whatever he's accomplished in Europe. He's going in the history books, but that shouldn't hold a lot of weight when you're evaluating his skills.
Ok, let's look at what it means to be a superstar in the NBA. There's only 1 real quality you need, be able to score. Talking 25ppg+ in their prime.
1) Ayton has this superstar potential because he's an elite force on offense. He's one of the strongest, yet mobile bigs that fits with the Embiids and KATs. He dominates opponents down low more than Cousins did at Kentucky. On top of that, he's got a very good mid-range shot, and a developing 3pter. He's a physical beast at 7'0 240lbs. He's got the athletic tools+skills to be a 25ppg+ scorer.
2) Bagley has an edge for scoring. Elite PnP/PnR player. He's more of a project than Ayton, but his ability to score pts in short-term notice is AD-lite. He hunts for putbacks and has a non-stop motor. He's also got a good mid-range game going for him, and a developing 3pt shot. He's shown that if you need points down the stretch, he'll find a way to get them despite his conceived rawness. Athletic tools+motor+skills to be a 25ppg scorer.
3) MPJ is the biggest wildcard in this entire draft because of his back. With that aside, he's almost 6'11 with a near-elite jumpshot. He's got good quickness, and very good vertical bounce. His calling card has always been his scoring ability. He can score from anywhere on the floor due to his jumper. His handles are good for a player his size, and you can see he has a 3-level attack. On top of that, he plays very well off the ball getting inside or getting open. He has a scorer's mindset. Athletic tools+jumpshot+mentality to be a 25ppg scorer.
4) Young, one of the bigger bust candidates, but like MPJ, near-elite jumpshot. Great shooter. He has no problem being the go-to scorer and we saw it at Oklahoma where he carried a bad team into the tournament. On top of that, he's not selfish. He's got great handles and the ability to create his own shot. Probably the best out of the entire class. He's also got great quickness which allows him to attack in the open court and get to the rim. Of course, shot selection and lack of strength are his knocks. He's got the ball handling+jumpshot+mentality to be a 25ppg scorer.
The only players I've regularly seen being regarded as having "superstar" potential is Ayton and Bagley. I've only seen a handful argue for MPJ, and less so for Young.
So what's the biggest obvious thing that separates Doncic from those guys? He's just not the same type of athlete. I'm not going to say he's a poor athlete, but he's clearly a tier below any of them. His first-step is severly lacking, and as a result, it hampers his ability to beat defenders 1 on 1. He does a good job creating separation with his shot from his step-back jumper, but you need to see more than just step-backs from him. If you're talking "superstar", then he needs to be able to create his shot consistently and effectively. Due to his lack of quickness, sometimes he struggles to beat defenders in isolation. He's not always able to get to the rim. His handles can improve, but more often than not, right when he passes up the half-court line, he shields his body away from the defender to alleviate pressure. He heavily relies on picks to get himself free and open. It really comes down to his quickness. Some question his scoring capacity due to his athletic limitations.
I haven't seen anyone say that Doncic is a finished product anywhere. It's not all that bizzare to question whether or not he has superstar potential. As I said over and over again, there's only a handful of superstars in the NBA.