I don't think that helps support the argument, though. Despite using a stylus-driven touchscreen, the Palm Pilot UI had a lot more in common with the desktop UIs of the 90s than with today's smartphone UIs or even today's smartphone-tainted desktop UIs.
Palm pilots had ui/ux more closely resembling today’s smart phones than you think. The swiping keyboards, for example, more closely resemble the script used for fast typing on a palm pilot. The ui was meant for touch, not for precision. At least the games didn’t have ads back then.