I'd imagine that zoom length is a massive factor. I could be wrong but usually cameras in something like a news studio are reasonably far away from the host. It might not seem like much at scale but it's probably a more considerable distance than even putting a camera on the other side of the room in your home. It also explains why, from a perspective standpoint, a headshot of a host on cable news will always looks different than, say, the headshot of a Twitch stream (Twitch streamers tend to use far smaller cameras that are way closer to their faces).