A friend described calls as "high bandwidth information transfer."

An average typing speed is 40wpm but an average conversation is between 120 - 150 wpm so about 3 - 4x bandwidth.

Calls also offer sub second latency and maximum priority.

When you add video and audio in there, the pure amount of data transferred is higher.

Weird that I’d say almost exactly the opposite. 1-1 speaking is one of the slowest forms of communication today.

Writing copy is 1-many and the many readers can read much faster than they can listen.

Making a demo video is also 1-many and can be sped up (who doesn’t listen to content at at least 1.2x these days?).