Fraudulent charges on an existing account is not the concern when someone has your SSN and other high-value information - it's the ability for someone else to open an account in your name that you have no knowledge of.
And here is the really sad bit, when you tell the debt collector that its a bogus account and not you, by law they have to stop hassling you but instead of 'retiring' the debt they just resell it to another debt collector to get back some of the money they paid for it. So the cycle doesn't stop.
No doubt these layers of protection will fail for some people. Maybe Equifax should be required to set up a fund to pay out to such people. But it's not apocalyptic like people are making it out to be. OPM leaked the records of about 20 million people a few years ago. So far, there hasn't been any sort of mass-scale impact as a result of that breach.
(although that appears to be ordinary incompetence)