I'm guessing you've never had to give lectures to students who are staring at screens instead of your presentation and are clearly not paying attention? It's di

I'm guessing you've never had to give lectures to students who are staring at screens instead of your presentation and are clearly not paying attention? It's distracting for the lecturer as much as it is for the students in the room and it makes the job much more challenging to focus. No one wants to give a lecture to a room of people who are uninterested in the material.