I think a lot of people pointing to the success of the GSW and pointing out Curry and Durant as examples of what Luka and Fox could of been, is missing the boat.
Durant is high volume scorer, but he is NOT a Point Guard and he rarely brings the ball up court like a point guard. His game is not predicated that he bring the ball up the court to survey the court. Almost always, someone else brings the ball up court and he is already on the 3 point line looking to get his shot and to score.
Having two heavy scorers like GSW doesn't mean they have two main ball handlers or Point Guards. Durant is not a Point Guard. Also, Paul George is NOT a point guard.
Luka Doncic is a Point Guard. De'Aaron Fox is a Point Guard. They play their best when they have the ball coming up court to survey the land and decide if the want to attack or pass. They play the same position.
Those other comparisons of GSW and OKC are confusing high scoring players (i.e. Durant, Paul George) as primary ball handlers. These guys are scorers. They don't need to bring the ball up court to score.
You take the ball out of De'Aaron Fox hands and just have him stand in the corner waiting for a kick out 3 pointer, you are not utilizing what makes him special, which is his ability to use his speed and decision making to take over games at point guard. For that matter, D’Fox at point guard is what makes this team special.