Interrupting when talking is simply the human equivalent of XON/XOFF flow control in RS232. Some humans are not capable of such software flow control and need t

Interrupting when talking is simply the human equivalent of XON/XOFF flow control in RS232. Some humans are not capable of such software flow control and need the human RTS / CTS handshake which is probably body language. And then other humans simply don't have flow control enabled. At all.