Interestingly you don't touch one of the arguments, physical connections limit the connections (as in bandwidth and future updatability) but the same is true for the internal of cpus and their connections with the RAM and when evolution it's not enough disruption comes to the play, optical connections.
Regarding the screen size and the usability factor, same could have been said about the pc (the keyboard has certain size for some reason) but the goal is not to carry a pc but to extends our capabilities through it and eyes sir are a weak link in a bright future of tech I'm not sure I'll see or may never happen (<dream>and this is totally offtopic and it's even daydreaming but... sci-fi like the extremis armor were mechanisms and tech are fused to the actual human may be the path... with the appropriate tech, you never know when one of those "damn nature you screwed this time with this human" times, curiously the errors make him an uber genius; will create it</dreaming>).
remember we are machines of ideas and our body the bare metal on which our vm runs.
Regarding the screen size and the usability factor, same could have been said about the pc (the keyboard has certain size for some reason) but the goal is not to carry a pc but to extends our capabilities through it and eyes sir are a weak link in a bright future of tech I'm not sure I'll see or may never happen (<dream>and this is totally offtopic and it's even daydreaming but... sci-fi like the extremis armor were mechanisms and tech are fused to the actual human may be the path... with the appropriate tech, you never know when one of those "damn nature you screwed this time with this human" times, curiously the errors make him an uber genius; will create it</dreaming>).
remember we are machines of ideas and our body the bare metal on which our vm runs.