There are a few points worth emphasizing.
(i) The protection philosophy. I had wanted to deal with this but sjj was faster pointing it out (it´s the time zone difference
). Historically, the issue and trauma were "broken legs", i.e. fractures and the aim was to prevent this sort of accidents. Over the years the bindings became fairly succesful and they offer good - though not 100% effective - fracture protection. It was a simpler task dealing with fairly constant bone strength (constant unless there´s strong osteoporosis in progress).
I´m sure that the old Marker Electronic of 1980 was a child of the old era and it concentrated on the simpler fracture prevention.
Otoh, the newer ligament issue is a much more complicated one because af all those variables involved (cf. also Glytch a few posts back). IMO that´s also one of the reasons there are no electronic bindings ready to hit the market.
(ii) Current mechanical bindings are strongly influenced by the time factor.
If the shocks/impulses are longer than about 1.5-2 seconds (which is typical for recreational falls occurring at lower speeds) the time plays little role. It´s the DIN setting that decides. The release takes place in a "quasi-static" regime.
Otoh, in t = about 1 sec the dynamic mode appears where the release mechanics works as I described yesterday and where the time t is decisive.
F = 200N and t = 1 sec equals F x t 200Ns
F = 400N and t = .5 sec equals the same impulse 200Ns
F = 1000N and t = .2 sec equals the same 200Ns
That´s why you can set the bindings with higher DIN if short-time shocks are expected (as in racing on ice). Truth is that if such a binding occurs in a "slow" release situation it won´t open. That´s the risk a racer with current ("non-intelligent") bindings has to take.
If the premise and technical explanation are correct we have a strong theoretical argument why skiers up to a certain level should stay with the "official" setting and not experiment.
At the same time it´s a fairly simple explanation of what top-level skiers and racers know already: you need more.
Again, I have used the article I already mentioned, written by a friend of mine and brother of Mr. Seidl, the producer of all Markers at a Czech place called Kostelec. Unfortunately, the author died four years ago. I miss him very much not only because I can´t discuss it now again.)