perhaps this is a very simple understanding but from the articles explaining DIR and giving a history lesson of DIR and GUE, it seems to be that DIR is primary about the equipment one uses. And the RULE # 1, do not dive with unsafe divers.
I very much like the philosophy of diving with the least drag as possible but if I have no intention of tech diving, cave diving, deep diving, why would I need the 7' hose on my primary stage one?
Also, and this may be somewhat unrelated to the above, but if one uses a BP/W does that do away with most if not all of the weight they now carry?