DesignPaper doesn't need a firmware update.
The degree to which a tool captures intention without introducing its own noise. The ideal sketchbook has zero input fidelity problems: the mark you make is the mark you meant. Every tool that falls short of paper is fighting this gap. Palm rejection, lag, and stylus drift aren't features; they're apologies.
The degree to which a tool captures a user's intention without introducing friction, lag, or distortion.