Media Richness Theory

Management scholars Richard Daft and Robert Lengel introduced Media Richness Theory in 1986: each communication medium can carry a different amount of signal. Face‑to‑face is richest—tone, facial expression, rhythm, eye contact all convey meaning. Phone is next. Textual messages are the poorest—only semantics remain.

Key insight: **The fuzzier the task and the higher the emotional load, the richer the medium needed.** Sending an address can be done in text. Calming an anxious customer? Text alone almost always fails—because you cut off 80% of the signal bandwidth.

AI customer service lives in the most impoverished layer. It isn’t “not smart enough”; its medium simply can’t transmit the signal “I care.” That’s why 79% of customers want a human for complex issues—not because they hate machines, but because the human trust system requires rich signals to function.