From the other comments, it always had fully unlocked wired-USB support. And they did build Bluetooth support into the controller, and released software to enab

From the other comments, it always had fully unlocked wired-USB support. And they did build Bluetooth support into the controller, and released software to enable that Bluetooth as Stadia was going under. Still seems really weird not to enable it from the beginning--what would they lose?--but the made the right decisions during design and at the very end, at least.