Here's something I don't think anyone is thinking about. Some may see this as me being "overly emotive" about this, but I'm speaking from a position of having experience with this:
Imagine that a diver has a diving accident and unfortunately is now unresponsive/unconscious. We've gotten you out of the water, are rendering life support, and administering 02, while awaiting the Coast Guard. When the Coast Guard arrives they ask us:
What were the dive profiles, gas mixes, etc? We give the info from our roster sheet, the diver's computer, info from buddy, etc
What are vitals, signs/symptoms, care provided, timeline, etc? We provide the written notes we've been keep from the moment we spotted the diver in the water until current moment
Does the diver have any medical conditions, allergies, taking any medications, etc? We provide them the diver's signed medical release that has nothing but "NO" written on it.
If the diver has lied on any of the "NO" responses the people now rendering medical care for that diver have no idea what they are dealing with. Irrespective of whether or not such undisclosed conditions/factors/issues actually CAUSED the accident or even whether knowing about conditions/factors/issues would have PREVENTED the accident...the fact of the matter is NOT KNOWING ABOUT THEM NOW could have a dramatic impact on the care that is administered.
There are literally hundred of conditions, diseases, medical history, allergies, etc that may be completely unimportant before entering the water, but that could literally mean a life/death turn of events during emergent treatment of a diving accident.