Most discussions of steaming center on trying to find green wood or as a next step air dried. Very low moisture content in bending stock is considered a liability. If heat alone was the mechanism of choice for bending the steam box would have been replaced by an oven years ago. I have steam bent white oak, ash and cedar with no problems using wet steam. Once the box is loaded and up to temperature a single person can't work fast enough to run out of material if you put in a new rib ench time a steamed one comes out.
edit for fat fnger spelling
You have to be very careful when you don't know where your'e going or you won't know when you get there- Yogi Berra