While it’s correct to assert the FTC can’t choose to ignore its enabling act, it’s false to say: 1) the FTC has no say in the laws they are supposed to enforce 2) Congress controls the laws the FTC is tasked with enforcing.
As to 1, the FTC writes the laws it enforces. These laws are called regulations. As to 2, of course Congress could write laws that have to be enforced, but when it comes to regulatory agencies, Congress does quite the opposite. Instead of writing the laws concerning trade, Congress wrote an enabling act delegating this authority to the agency.
Calling for the replacement of a branch of government without understanding any of this would be avoidable with a better educational system.