" ... putting pretty much all the shops after security clearance will make the Great Hall completely uninviting for people seeing off or welcoming home friends and family ... "

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Perhaps Mr. Goldstein has stumbled upon the point he missed.

Most of us, upon arrival at the airport, simply want to dump our bags and get through security as fast as possible. Pickups and dropoffs at the curb. It’s likely more business is done near the gates, not in the big building. 

So perhaps the airport folks actually do want to limit need for nonpassengers to venture inside. Which will be more pleasant for everyone else who is flying.