I've asserted in the past that knowhow is fundamentally impossible to transmit between humans.

I think it's partially related to the second law of thermodynamics.

As a signal propagates through a transmission medium it diffuses.

This means that within a transmission medium, signal propagation is a broadcast.

This quickly creates a cacophony, so you must create a boundary to prevent the signal from propagating too widely.

For example, you create an insulated wire and transmit the signal through it; the signal is a broadcast within the wire but does not escape the wire except at the ends.

Boundaries, to be effective, must only allow a small fraction of the internal signals to exit.

If they didn't, it would be a cacophony and impossible for any signal to be heard above the background noise.

The more narrow the pipe to another system, the more signal that has to be elided, perhaps many many orders of magnitude.

Knowhow is a complex set of states maintained inside of our brains.

Knowhow can only be transmitted at the rate that someone can speak, at the limit.

That's a teensy tiny straw to pass ideas through.