For me personally, almost everything about the JRB methods & system seems way overly complicated. There's no way I could use half of it because
there are too many different knots & I know I'd probably get one wrong on a bad day. Not saying there's anything wrong with the systems, I just feel like I have to be Harry Houdini to learn all that stuff & be able to do it in the dark when I'm flat exhausted.
I can one stick, rappel, srt, use steps & stands, all with minimum, light equipment, & have simple easy to tie safety back ups. Some of that stuff just overcomplicates areas that can create more problems then solve. To each their own for sure & my hat goes off to ones that are as proficient as the guy from 50 shades of gray, but not me. There have been too many times I tried learning some knots that I thought were right & when I tested them at ground level realized I missed a step or direction. I tend to stay away from too many steps & turns if possible.