Respectfully, I disagree.
Yes I do think that it would make a difference. I think that it would give AJ a greater understanding of the product(s) that his company is offering.
I'm not stating that AJ should fly Y SYD-LHR all the time. I'm not suggesting that you as CEO of GM should always drive a Barina. I'm suggesting that you should drive a Barina at least once after it has been through a major change. I'm suggesting that the CEO of Mercedes Benz should drive a C, S, E class to try out the product(s).
I'm suggesting that AJ should fly SYD-LHR in J on a sloping bed to experience the PJ wedgie himself to understand why some customers are flying EK vs QF etc etc. Personal experience speaks more than an email forwarded from Customer Care.
I'm suggesting that experiencing a product would give anyone a better understanding of the product. AJ should fly Y at least once a significant change has been made to the product offering.
I'm suggesting that if AJ had a fish & chip box without cutlery in Y flying SYD to ADL he would have been on the phone to catering to ensure that cutlery & wet-wipes were given out with the meal next time. Without Red Roo on this forum, feedback on this one issue wouldn't have been able to be passed onto QF with such speed & ease.
I agree with your point about cabin crew not flying Y. However, they aren't decision makers with regards to the product offering(s).
Anyway, I apologise for taking this topic off on a tangent.