You miss them. Not their faces.

We can only assume that if the author of previous comment actually missed them and not their faces, they would have said so.

My personal happiness plummeted, anecdotally, when my coworkers started dropping the video feed one by one. It was surprising, but noticeable and significant.

Same for me. There's just little things about interacting with a person face to face, personality aspects like how they express themselves: posture, eye movement, facial expression even. They just add to the interestingness of the work.