IMO this is a non-debate caused by people confusing two different issues.
1. Geno loves it when players can do as much as possible. He adores the idea of a post that can do some ball handling, or shoot from distance, or pass like a guard. He loves guards and wings when they work hard on their rebounding, or post up when they have a mismatch. He encourages players to expand the horizons of what they can do, because it makes them more versatile and less predictable. The whole team benefits. And he always has.
2. What I suspect Geno does NOT love is the idea of a player dictating where she wants to play, even before she steps on a court at UConn. A player might have a pair of mental lists: "Stuff I like / want to get better at," and "Stuff I don't like." Geno has only one list: "Stuff the players will do or skills they will learn, whether they like it or not."
So if A'ja came to UConn, Geno would encourage her to continue developing her wing skills. She and Stewart would be great complements to each other, with A'ja perhaps receiving kick-out passes, or learning to distribute from the key a la Stef Dolson, or what have you. He would also encourage (read that as "order") her to continue improving her post skills, which she is already good at as was seen in the U-19 games. Geno would want her to do and learn everything she's capable of learning, for the benefit of the team. And if she were to balk at defending a 4 or 5, or posting up from time to time, or boxing out...she would be getting friendly with the feel of the bench.