During the Renaissance, the five senses were understood to form a hierarchical system from the highest sense of vision down to touch. Vision was correlated to fire and light, hearing to air, smell to vapour, taste to water, and touch to earth.
Perhaps the human fascination with fire stems from the totality of its sensory stimulation. The fire gives a flickering and glowing light, ever moving, ever changing. It crackles and hisses and fills the room with the smells of smoke and wood and perhaps even food. It penetrates us with its warmth. Every sense is stimulated and all of their associated modes of perception, such as memory and an awareness of time, are also brought into play, focused on the one experience of the fire. Together they create such an intense feeling of reality, of the "here and nowness" of the moment, that the fire becomes completely captivating.
When we use non-spatial social apps, we often understand that another's cognitive presence is there, but we can't feel the more human presence we're wired to need. When we're not social distancing, we fulfill this need elsewhere, outside of software. We meet for coffee. We go on a walk. We play a game, or show a friend something funny on our phone and watch them laugh. We have infinite options at our disposal for relating to others. Though the lack of these same options inside the software we use is sometimes inconvenient, we can usually get over it.
But things are different right now. We're constrained to rely almost exclusively on software for social interaction. What are usually minor inconveniences in our existing applications are now the main factor preventing us from fulfilling our social needs.