Use it to your taste. Just don't make the lighting totally flat with it. A kiss of fill light is the norm. AND a dimmer. OK, now you have a three point lighting set up.
Lets move on to the background.
I always try to make my backgrounds as out of focus as possible. That's the main reason the camera is as far away as possible from the interviewee and the interviewee is as far away as possible from the background. What this is doing is forcing the camera to shoot with a long focal length for a chest and head shot, with room for an even tighter second shot. A Dedolight Patten Projector on a Dedolight or a 200w Pepper or an Arri 150 is one way to break up the background. A slash of light, or oval of light behind the interviewee is another pleasing effect.