but it is approved by the FAA, EASA, CASA, CAA
True, but it's not what you think. The FAA did a three month trial in a big jet's cockpit environment, then EASA, CASA and the CAA followed like lemmings after the report was published.
There is also some merit to the rumour of choosing Apple over other players in that it was to the benefit of the US economy.
iPads are consumer grade items, being an Apple product they are generally a cut above the rest but they are still consumer grade nonetheless.