That's a damn good point. It could be chat bots talking to chat bots all the way down and we'd never know the difference.
This is a quality of the kind of knowledge we deal in here. Compared to first-hand experience, it is a lesser quality of knowledge. A trashy knowledge if you will.
Consider that when you read, there are 2 sources of information, the arrangement of the words and the meaning of the words. The arrangement comes from the screen the meaning comes from you. Which is the bigger hunk of information?