I am a diver (and a fly fishing addict). The first rule in (both) these endeavors is to have everything strapped to your vest (or your “BCD” in diving- same thing). There is too much going on (over or under) water to test fate and a wrist strapped light isn’t an option diving. You indeed have a lot of hoses and stuff that has to be clear for safe use— so the light needs to be tethered and stowed out of the way until you are “down”.
We used my SD02 last December on a night dive. I borrowed my fly fishing tether to connect the light where if it got loose (and it did)- it dangled until you got hold of it. I probably would have lost that light without it being tethered to my BCD that dive. Just dropping out of the boat involves some stress on gear and you often have to “adjust” things after dropping in.
Oh, and the SD02 also has ONE (wide) tail notch which allows for a larger clip- a good thing for diving as I can see using a thicker tether and clip that my fly rig I borrowed has. Thankfully, it held the light and I didn’t have a hard “yank”. But I do recall coming out of the water and having the light dangling as it didn’t stay stowed under my BCD when I took it off to climb the boat latter.