The TSA part is equally effective as a metal detector is.

You're confusing the workers for their tools. Like saying I don't need a mechanic to fix my car, just a wrench and a jack.

It would mean several companies lose out on massive contracts for that fancy equipment, which is why it won’t happen.

The government kickbacks to hardware supplies isn't the reason you think TSA are being rude to you. And this stuff doesn't get meaningfully less expensive when businesses buy direct.