Except mechanical watches fail all the time. The sapphire glass shatters, or a strong impact disrupts the movement, or a user doesn't screw down the crown and

Except mechanical watches fail all the time. The sapphire glass shatters, or a strong impact disrupts the movement, or a user doesn't screw down the crown and water enters the device. They require expensive regular services. Rolex has a long history of being a tool watch, and mechanical watches can be used in a lot of neat ways, but I would never want to depend on one in a life or death situation without fully understanding a backup plan.