I'm surprised no one here has mentioned the power dynamics of interruption. It is well known in psychology that interrupting anothers speech is a way to exert power. The boss can interrupt anyone, no one interrupts the boss. It's one of several types of interruption:
Interrupting someone can say "I am more important than you". This can also cause failures to communicate since the boss can change the subject and the interrupted speaker may never get to finish their thought. I've seen projects fail because a boss intentionally interrupted people who were trending in a direction they did not want to go, squashing anyone who was pointing out a major flaw in the bosses plans, which resulted in building things in a bad way and then having the flaw manifest and cause the project to fail.
There are other types of interruption though that can be more supportive or more like parallel conversations. The efficiency of those often depends on the quality of the participants memory and ability to follow multiple threads simultaneously.
https://www.psychmechanics.com/psychology-of-interrupting/
Interrupting someone can say "I am more important than you". This can also cause failures to communicate since the boss can change the subject and the interrupted speaker may never get to finish their thought. I've seen projects fail because a boss intentionally interrupted people who were trending in a direction they did not want to go, squashing anyone who was pointing out a major flaw in the bosses plans, which resulted in building things in a bad way and then having the flaw manifest and cause the project to fail.
There are other types of interruption though that can be more supportive or more like parallel conversations. The efficiency of those often depends on the quality of the participants memory and ability to follow multiple threads simultaneously.