Now, when I work from the top of a hill down, it's scary doing it with the fel bucket. Same when pulling the boxblade down the first time for the same reason that you never know what your tires are going to run over. Compound that with a steep slope and it is a recipe for disaster. However, bulldozing down the slope backwards offers:
a) excellent vision of what you are pushing or approaching
b) a ready made road and smooth safe surface for your tractor tires to be on
c) you have the wall of dirt against your boxblade to act as resistance ... a brake, to keep you from suddenly rolling down the hill.
You can keep your eyes on that much easier than guessing if the fel bucket is filled up or not? Going forward down hill and trying to use the fel bucket, I've skidded over rocks thinking I was grabbing them with the fel bucket, and then zoom ... I'm head down hill. It is scary. Once you have the "road or trail" established so your tires have solid and level ground, you can try to do stuff going forward.
Although this is not a big drop off, this photo shows how the dozer blade in reverse makes a "road" again for the tractor. As I cut down the slope, I push dirt farther and farther down the slope and pretty soon I have a safe slope going down the drop off.
The other thing is you can tilt the boxblade sideways with one side higher or lower than the other. This means when you cut your path along a slope or diagonal to it, you can make it level immediately instead of following the tilt of the slope like when cutting with the fel bucket. You may have to back up several times to get the full width for your tractor tires, but once you do that your tractor is no longer tilted sideways in danger of tipping over. That's why guys who run bulldozers can cut those roads into hillsides. Their dozer blade is in front and can be tilted, so the rest of the machine follows a relatively level path, instead of tilted.
Bulldozing in reverse and tilting your boxblade will allow you to do similar things, only on a much smaller scale, of course. Again, I offer this information as to how I operate my boxblade and it has worked great for me. Others may disagree and that's OK too.