I agree any guard - and Sarah - can ably bring the ball up the court. But that’s not all a point guard does
There’s a reason there are separate point guard camps where pgs go in the offseason to improve their skills. A good pg can not only handle the ball she knows which offensive set to begin based on how the opponent is defending her teammates. She sees where to pass the ball, where to go if the defense shifts, and is already thinking of options if teammates have to rebound a missed shot. And that’s my rather simplistic description of how much is involved
A shooting guard, like Ash, is hunting shots rather than setting up the offense for other scorers. That’s her job, so to speak, like Azzi. The skill set might be similar but the mindset is different
Players really aren’t interchangeable. Just because a player is tall doesn’t mean she can play post. Remember when Geno had few post players and 6-3 Ann Strother played in the paint? It did not work . Coach can’t move players around that easily. Turing a SG or wing into a pg won’t work either