OK, so what exactly is so hard for your average PPL to understand about a RIAB? A join via initials is a useful alternative to a standard overhead join, and although developed initially as a military technique, is surely not that hard for anyone with half a brain cell in the family to comprehend. A RIAB is just a development of that technique, employing a slightly tighter circuit. Surely a simple classroom brief on these methods would not overly add to the burden of a PPL course? Don't even get me started on the normal square PPL circuit, generally flown well outside the protection of the ATZ......