As is so very common, you rely upon the
false dilemma fallacy. Your black and white thinking assumes no middle ground. Perfection can never be achieved, so you mockingly assume that the only alternative to perfection is doing nothing. In his excellent book
Leading Minds: An Anatomy of Leadership, Howard Gardener identifies this as possibly the greatest problem of leading a diverse society. The problem is that good solutions cannot be reached because of the destructive influence of that portion of society that thinks in those terms. Gardener believes their worldviews are frozen at what
Piaget identified as the thinking of the five-year old mind.
People with that mindset destroy all attempts to find a middle ground, because to them all middle ground thinking sounds like a lie. Things are either good or bad, right or wrong, black or white, etc. If it is not
exactly what they think is right, then it is unconditionally wrong.
There is no question that we should always seek improvement, but we have to be realistic. You have ask how big the problem is that you are trying to solve and what kind of effort it would take to solve it. For example, why aren't we putting more effort into finding the best ascent profile possible for NDL dives? The answer is because only a tiny, tiny portion of NDL dives done today result in DCS, and exploring all possible ways of solving this tiny problem would be enormous. It isn't worth the effort.
So how big is the problem in this thread really? Would it be worth a multi-billion billion dollar effort that would raise the cost of scuba beyond the means of all but the wealthiest individuals and still not make a meaningful difference?