They could regulate the size of the bag, or require that all bags be clear, like some events do. I used to go bagless, but with the metal detectors I find it's easier to carry a small crossbody bag for phone, wallet and hand wipes than to empty multiple pockets and try to keep one eye on my stuff so no one steals the wallet or phone while I'm going through. Since 90% of my trips are solo, I don't have someone else who can keep an eye on things.
The area I wish they would address is International Gateway. They need to move the tables out to make room for the detector. All it takes is a stroller or
ECV in the mix and there's no room to move because of the sharp turn to the left. If the detector was where the tables are currently located and the tables moved out, the flow would work much better.