From what I've seen on twitch and what I've experienced myself, most of the time the Attached camera is used as a 3rd person camera with a smooth following.
The issue is that ingame you really have a vague idea of where the camera is in this mode and you don't really know where to look at if you want to interact with the audience, or even if you're wondering what the camera sees for testing purpose.

Here's an idea of what it could look like ingame: