Healed afflictions are supposed to happen when a rider is transformed into a beast IIRC, such as lobsters and machakan spiders. Some others might benefit from this effect, but It's not intended to be usable in general. No voluntary shifters risk getting rid of afflicitons
The dragons, etc, do transform from their human shapes if wounded/killed right?
It would seem to make sense to recover at least afflictions gained while being "killed" as a human.