Many of these metrics are accessibility related. It's scary that most of the highly-praised ereaders (such as Wired / New Yorker / Time magazine's apps) eliminate the inherent accessibility of digital text. Of course, this is a transition period, but why not start off on the right foot? Digital text isn't the same artifact that printed text is. Let's not treat it like it is.
Until things improve, I'll be reading those excellent long-form New Yorker pieces in Instapaper, thanks.