> That ATC still takes place over radio just seems insane at this point.

There is digital comms with ATC without voice:

* https://en.wikipedia.org/wiki/Controller–pilot_data_link_com...

* https://www.faa.gov/air_traffic/technology/DataComm

But in the highly dynamic environment of final approach, landing, and taxiing, I doubt it would be practical. Unless we want to try autonomous 'driving' on taxiways and runways?