They’re “emulated” in the sense that they are custom widgets designed to mimic the appearance and behavior of widgets from the OS’s native UI framework. They’r

They’re “emulated” in the sense that they are custom widgets designed to mimic the appearance and behavior of widgets from the OS’s native UI framework. They’re fine from a performance perspective, AFAIK, but you run the risk of the replicas imperfectly emulating some aspect of the originals’ behavior and creating an “uncanny valley” effect.