Leadsled, I'm sure you and others are correct about airline lawyers doing the CASA dance and ensuring legal compliance. My Qantas pilot spies tell me that at the cockpit/operational level CASA has NFI.
To put that another way: A pilot can tell a CASA inspector about the thronomister and the CASA guy just says "Yeah, right!". iPads seem to really throw them.
Having said that, I find it hard to believe myself.