>are not the basic principles the same
In the end they probably are.
It might simply be that this is a comparatively new thing for many people. We've been talking to each other for millenia, we've been writing for a little less time, talking on the phone for a relatively short time and communicating on-line for a miniscule amount to time.
It takes time for people to internalise the method of communication and at any one time there will be people in a group with a wide variety of experience. It will take time to become more sophisticated at analysing the feedback that exists. From my own experience of my parents use of the telephone, it took nearly a generation for the ability to make full use of the telephone for seamless conversation to become widespread. Take up of on-line communication is significatly faster but we are still in the very early stages.
