Voice with no camera is its own medium, not a stripped-down version of video chat. Three things change immediately.
The first is that nobody is performing for the camera. Video calls have a built-in awareness of how you look, where you’re sitting, what’s behind you, what your face is doing. That awareness is a tax on attention. Drop it and the attention goes elsewhere — usually into what the other person is actually saying. The first time you do a voice-only call after a long stretch of video calls, you’ll notice you remember more of the conversation. That’s where the freed-up bandwidth went.
The second is that the floor for showing up gets lower. You can be on a voice call without combing your hair, putting on a shirt with no holes, or sitting somewhere photogenic. You can be in bed. You can be doing the washing-up. You can have a baby on your lap. None of those things need to enter the call.
The third is harder to describe. With no visual to anchor on, you stop pattern-matching the person to people you know. With video, the brain unconsciously fits the face to similar faces, the room to similar rooms, the look to similar looks — before either of you has said anything substantive. With voice, that process is much weaker. You have to actually listen to find out who they are. People sometimes describe this as feeling more honest. It might just be that the usual shortcuts aren’t there.
None of this is a moral argument. Video chat exists for reasons. It’s great when you actually need it. But for the talking-to-strangers case specifically, the things video adds (mostly looks) aren’t the things you want. The things it subtracts (mostly attention, mostly low-friction availability) are.
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