They do. The Quest Pro I have has been getting better and better at bare-hand control with each release. But AFAIK they all come with controllers, and it is the default (and generally is still easier and more precise to use, despite the continually-improving hand tracking).

No, only a small selection of games do hand tracking and it's usually only good if it's been made primarily for handtracking. Even with true hand tracking games, the amount of controls you can do is limited.