The right tool for the right job comes to mind. If you are attending a wedding you usually dress up that is function to the event you are at. If you are digging ditches or cleaning gutters you wear the appropriate clothes for the job at hand again function.
While scuba diving or using rebreathers I wear Force Fins because of function.
Excellerating Tan Deltas is my fin of choice for efficiency, power and durability. What gear is in your gear bag and why?
Safe Diving!