David, I'd like to hear your thoughts on why the DA/SA curve is an inverted U.
Watching this interesting video from Caleb, it's clear to me that when he uses the term utility (at least for the shooter with middling skills), he must mean utility relative to other types of handguns, as opposed to utility in an absolute sense. If he meant utility in an absolute sense, the utility curve would seem unlikely to trend downward as skill increases.
It would be very interesting to compare a set of absolute curves for a variety of types of concealed handguns.