This is the traditional, standard line of demarcation between recreational and technical diving, and I think it's a good one. I would just add that there is somewhat of a grey area; for example two divers could do identical dive profiles, one could have a deco obligation and the other might not, depending on the computer settings used. It's not that different from the grey area that exists between recreational hiking and technical climbing. In that case, it's sort of "if you fall would you die; if so, it's technical" and of course conditions can play a big a part in that determination.
