Judging by this thread those who dreamt up, designed, drew the charts, named the procedures, certified them, trained for their use and worked in ATC to control aircraft equipped to use this new technology have actually increased the margin for error because so few of those who use it haven't for a clue of what it is all about!
If ever there was a topic that needed a clear and unambiguous explanation and training material, this for sure must be one. Jesus, I don't even understand the naming conventions associated with RNP, but I'm still permitted to fly the approaches!