I don't know about other parts of the world but when busy, it was eyes out the window and almost non stop talking. No time to be looking down at electronic controls. Often aircraft would be given a taxi route only to have it changed on the way as other aircraft joined the flow. Sometimes more than once. Added to that, there is the requirement for pilots to read back instructions. How would that work?
To make your system work, I think it would need a lot more taxiways with multiple threshold holding points.
HD dead right.