Had to laugh at your quote as I had a similar experience once. Already grumpy from 4am wake up, got to the airport only to face the usual security and queuing mayhem and to top it off, my flight was already on final call by the time I managed to get through only to be stopped for the dreaded swap. The security took his time to wait for 2 more victims and did the bulk check the slowest way possible. At the end of the saga, I couldn’t hold back anymore and cheekily said that it was obvious to me then why the instant feedback stand disappeared not long after it appeared. I ran off before the security could say anything.I have the same problem in Adelaide as well, always told to get my IPad out it shouldn’t be in my luggage, told them I don’t have this issue anywhere else, and I was told the other airports weren’t doing there job properly, had a VA flight Attendant behind me and she said they Had the worst record in Oz for trying to upset people, she got pulled aside for a scan after that!