Carabiner hooks are very dangerous for safety's purpose: attached to "D" rings, in some situation they can self open and stay as is until it is too late to realize that you are not link to the boat anymore !
This happen more frequently than we think, not only on "D" rings but on any similar anchoring
On our harnesses, tether lines, only double action snaphook both ends are allowed.
Some tether lines are equiped with quick release hook, harness's side to allow disconnection in emergency
, but they do not sound very smart to me for following reason:
The hook can eventually be open without being noticed by the user.
In some situation, these quick release hook are very difficult to open and may not garantee 100% opening all the time.
Poorly maintained, the quick relase hook can be jammed by the corrosion
A good knife that everybody has in the pocket can be a well performing "quick release" tool with a better control instead of this type of hook.
Carabiners are used on board for non-safety related purposes and, generally, with light loads application only.