I agree with you that Antonio Conte has great potential to bring positive change at Napoli if given full freedom to form the squad he wants. Of course, losing a key player like Osimhen would be a big loss for Napoli because apart from his young age, Osimhen also has great quality, especially since Osimhen was once the top scorer in Serie A.
Antonio Conte was a great player for Juventus, a midfielder and he is also a careful coach and he did well when he had the chance to coach big teams. Obviously there are some things that he considers necessary to be able to do his job, and therefore he demands them from his contract. A Professional one.