With the Bose headset every passenger has to be instructed to press the power switch for every flight.
Every pax also has to secure their seat belt. Should this also be automatic? I would agree that automatic power on would provide a measure of convenience, but in the overall scheme of things, this is a very minor concern with this excellent product. Should not discourage anyone from buying the A20. In my experience, the A20 is in a different league when it comes to noise cancelling effectiveness and audio quality. None of the other headsets I have used come close.