Until we reach the ability to have a computer like the one in Star Trek that can actually talk and hear properly, the perfect device won't exist for me.
Voice and AI are still way too dysfunctional IMO. I still remember the scene from Star Trek 3 or 4 where Scotty is trying to talk to a 1980s computer using the mouse like a microphone! Epic fail of course.
Actually the best UI for a computer would be one that could be controlled directly by our brain (thoughts). I seriously doubt I will live long enough to see one that actually works well though. The speed of our thoughts is much faster than our mouths can talk or our hands can type. Our brains are working at the speed of electrons, which in Trekkie lingo is Warp One, the speed of light. Our mouths and hands are probably closer to the speed of snails by comparison.
