[Karrot_Kream]

Have a digital frequency for routine communication: like authorization to taxi, take off, clearances, flight plans, pattern requests, confirmations, and traffic. Keep an analog frequency for communicating through emergencies (kind of like Guard).

[bencoder]

Sometimes dangerous situations are averted by pilots realising the controller had made an error, like clearing a plane to cross a runway while another is taking off [0]

This kind of thing might be much harder to catch if clearances are given in text, or even impossible if they are routed only to the specific aircraft.

[0] https://youtu.be/w9lXcDYTg3Q