Re #3. These may have existed but were in no catalog or literature that I ever found, and I amassed a lot of data on the entire Bronica series.
The two most important? The weight and the weight!
My wife and I carried an RB and lenses all over the place on hikes at one time. No more.
I should also mention that the Bronica takes 2x more photos per roll, which gives me a lot of shots per shoot with that less weight.