Why is the fact important? If a unidirectional bezel is knocked and unintentionally moved over a dive, it might only Exhibit an extended underwater time. Which means the wearer will overestimate rather then undervalue immersion time, and in scenarios that call for decompression stops, this can be a make-it-or-break-it element https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/