RTA is what deprecated PICS. PICS was far too complicated once they realized trying to create all the categories was going to be impossible to fit into a single header and user-driven-content would be far too dynamic for categories and severity to make sense. PICS would have made more sense if all websites were operator driven and did not permit user generated content. RTA keeps it simpler in that "this may contain content not suitable for children". Just enough to trigger parental controls.