Re: CFSB - Ask your questions here!
I think, basically, because they work! Jeff and I were very open about the fact that CFSB is built on the foundation of the work and experience of others in addition to Jeff. Rip has shown the benefits of high-rep back squats in his writings, teachings, and in his gym. No reason to re-invent the wheel.
Your point about dumping and safety is correct. I spent a little time practicing dumping both BS and OH lifts so that I would do it as naturally as possible with heavier weights since I pretty much always workout alone.
Hope that helps.