Reading this question: How often does a pilot ask ATC for a repeat?
Most modern airliners' cockpits have plenty of digital displays.
Why is communication between ATC and pilots not also typed/written and displayed on cockpit screens, as a mutual backup with oral communication, so that slight misunderstandings and asking for oral repeat due to any cause can be reduced?
Since aeronautic communications are very specific and precise, some stenographic input device could be implemented too. Written communication could take over when taxiing or during ground operations, for instance.
Oral radio communication being therefore less saturated and more dedicated to emergencies and heavy misunderstandings?