Going from institutionalized forms of slavery common around the globe for thousands of years to the almost complete absence of it in today's world is still a major accomplishment. Three hundred years ago, slavery was seen as natural by many, today that would be an absolute fringe position almost no one would feel comfortable stating out loud. That is progress, even if it is not yet enough.

I’m sure modern slaves appreciate the fact that their situation, while in practice virtually indistinguishable from past eras, is no longer institutionalized.