As a new convert to graphical input on the Proline Fusion avionics and having use a touchpad on the Ejets and now converting to a trackball on the CSeries it might be interesting to look at different types of input devices and GUI in modern avionics.
Anyone who gets to use graphic flight planning having had to program an FMS via MCDU keypad in the past will find it a revelation but I think there are still optimisations to be found.