On or off camera is a cultural norm. I've seen teams that are on-camera all day in a team meeting which also acts as an indicator that they're available, and the people loved it. I've also worked with teams that never met except on chat. This team sat in the same area, but never seemed to talk, but you could see thousands of messages in Jira for each ticket they were working on.

Both scenarios worked because the norm was driven by the team. Where these norms become an imposition is when they're instituted from the top down.