> The context for such a meeting is to share knowledge and information, which discursive domain provides the reason for meeting in the first place.Yes, that underlying context is true but you're missing the point of my example. The professor example was not about "information" vs "friendship". It was meant to illustrate "engaged" vs "disengaged" in the conversation which is orthogonal to whether the context is teacher/student or friend/friend.
For example, professor X sits there with arms folded across the chest thinking the student doesn't really care about his class and is only there to lobby for a good grade.
Therefore the professor just answers, "Uhm, yes, I see. Well, I don't know what to say other than make sure you get your final paper in by next week".
On the other hand, professor Y was genuinely intrigued by something the student said and it spurs him to search his bookshelf and clarify something. He didn't have to physically get up to get a book but the conversation was engaging enough to do so. When the professor temporarily turns his back to the student to fetch a relevant book, that doesn't mean he's less disconnected from the conversation; he's actually more connected.
That's what I'm trying to convey: maybe measuring how much time your friend's eyes are glued to your face isn't the best way to measure connectedness. E.g. The professor X with the unbroken stare towards to the student was actually less engaged than professor Y that paused the conversation to find a relevant book.
Like I said previously, I can't argue with others' feelings. This thread shows me that everybody seems to have different thresholds of annoyance for others using their smartphone to look up something. Personally, I'm never slighted or offended by it. I actually feel complimented if our conversation prompted their fingers to type out a search request because of something I said. Just last week, I was talking with a friend about iron supplements and as we were talking, she typed in a search query for the most iron-rich foods. It was great as the conversation then flowed into spinach, tofu, etc.