Further to the point of visible vs. hidden cameras, people are much more social media aware, and the HMs are chasing that viral moment just as much as the producers are. For example, the so-called "underwear boys" and their "podcast" in direct view of a camera, but also their playing to the cameras in general. The boys aren't the only ones who use the cameras to their advantage; there's that gif of Holly spying a camera and suddenly snuggling up to Colin. I think it would be a much more natural fly-on-the-wall show if the cameras (hotheads or not) were hidden from view.