I agree with the author’s point that interactivity only happens when two subjects are actively engaging with each other through purposefully listening, thinking, and speaking to each other. In my personal experience, I used to feel lonely and left out when a person who I was talking to was scrolling on their phone while I was seriously talking to them about my idea during the team project back in my high school. I felt like I was ignored and I thought I was talking to myself. I think there was no interactivity at all in that situation.
Also, from what I learned in the class called Immersive Experiences I took in the fall semester last year, I think interactivity also needs to incorporate as much sensory information as possible. For example, if you close your eyes and block your ears completely when someone is talking to you, you won’t be able to know who that person is and what that person is talking about. So, a lack of interactivity can also lead to a lack of information and understanding in real-life situations.