You win we are all idiots and bow to your superior knowledge about airmanship and training.
No one is saying make it mandatory, they are saying it is a very useful instrument and can help train ham fists to recognize when the wing is operating efficiently and when it is not.
When operating a high performance aircraft on the edge of its performance envelope you do not look at the AOA indicator. You do however spend time before that training to know what the aircraft feels like at particular AOA settings.