It's a response to the GP, which makes the point that time in the field would still be spent with family. Time in the field with family is different from "spending time together" in the same sense that time on the computer adjacent to family is different from "spending time together". In both cases, your attention is on a task rather than on a person, you may be performing different tasks, and you're in close physical proximity but not necessarily doing the same thing.

Also I think many extroverts misunderstand introverts in this respect. My mom (introvert) and me (introvert) would often just read in the same room, and that was enough for us: I assure you, it felt very different than sitting with my butt against a complete stranger on the subway. My younger kids (introvert and ambivert) insist on digging their toes under my back while we sleep to make sure I haven't gone anywhere; they are not even conscious, but the proximity is important to them. This particular kid is an extrovert and has made about a dozen bids for my attention in the time between my previous comment and now (most of which have been reciprocated), but that is again the huge difference between sitting next to a family member and sitting next to a stranger on the subway. With family, that bond of trust is already there, and so you feel okay interrupting the silence to ask what your next move should be in Magic Sort, or why you can't download Township, or how do you turn the phone off silent mode, or showing me how he just beat his personal best score on 1 To 100, while you would never ask those of a stranger on the subway.