>"huge mess of transporting, storing, unpacking, preparing and disposing of food in all sorts of random ways at various times throughout the flight by the hundreds of hungry sleep deprived passengers."

That's generally handled by having a cart with a garbage bag attached that comes by, and having people opening their food on the small trays provided.

>"Airports would be even less efficient going through security, vendors trying to sell food to go and people congregating to buy things."

Yes. It is called a "post-security food court".

>"I would definitely pay more if even more things was standardized and included for everyone on the flight (like luggage, security, airport seating)."

That's nice for you. A lot of people don't want that, or aren't willing to pay.