I shot a little bit of press work on film a lot of years ago. It was all 35mm, but I learned quick, fast and in a hurry to have backup plans for when something went wrong - film would jam in the camera and couldn't be fixed in the field, a back would jam open, a lens would have a problem, and so on. Always had lots of fresh film, another lens, one or more extra bodies, etc. If I'd been shooting LF for press work, would have only been able to tote one body, maybe 2 or 3 lenses. LF shutters built onto the lenses were generally reliable, but they were clockwork [like] with springs and tiny moving parts. Not easily repaired in the field. When you use gear from the pool you may be accepting a camera that wasn't treated well or hadn't been repaired properly.
Now the important bit: events don't wait for the press! Having that second shutter might make the difference between f/8 and be there and waiting for the next call out. And waiting. And waiting....