I guess that "near real time bio-feedback" was sort of fun to see, but you could have gotten feedback on your air consumption all the same simply by watching your SPG, albeit to get the same sense of how depth, exertion, etc., affect air consumption, you would probably have needed to do many more dives. After enough dives, a diver does acquire a feel for how his air consumption is affected by depth and exertion level. After hundreds of dives, a diver doesn't need to look at a computation of "Air Time Remaining"--he has a pretty good feel for what the number is.
I think
@halocline has a point when he suggests there may be a diver who is "more interested in what's happening on a computer screen than in the water around him." I think a lot of people today just like technology--or at least feel extremely comfortable with it--and it's almost unnatural to them NOT to have a screen to look at. They want the smartphone, they want the smartwatch, they want a "smart" dive computer.
To me, one of the attractions of diving, like hiking in the woods and some other things I enjoy doing, is the opportunity to escape from electronic technology for an hour or so. The dive computer is just a necessary evil to me, and the less I need to look at it, the better.