One advantage of using larger formats is that the process is slower. It takes time to set up the camera. It takes time to visualize what you want.
When doing portraits, it enables the photographer to talk and listen to subjects, to observe their behavior. A camera can trap a photographer sometimes. You can look so intently through a viewfinder that you are unaware of the picture in front of you. When I use an 8-by-10 camera for portraits, I will compose the picture and step back. Using a long cable release, I will look at the subject and wait for the moment. It’s very liberating.