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