The core issue is not technical but rather human. In 1960s Bell Labs poured in massive investment in trying to make video calls a reality. They solved virtually

The core issue is not technical but rather human. In 1960s Bell Labs poured in massive investment in trying to make video calls a reality. They solved virtually all technical issues - in 1960s - and had real system deployed in NYC and other places. Here was the issue it never took off: people just don't like others to see them although they like to see others.. This might feel funny little thing but it ultimately lead to pulling out video handsets from the market. No amount of network effect and marketting helped its adoption. This experiment has been repeated in many forms by different companies in different settings with no real success. Everyone had solved tech issues, its just that screen resolution keeps increasing. The only area I can think of where video calls have minor success is corporate group meetings and talking to kids/parents but even in those cases people tend to be very selective when to do video calls vs voice-only calls.