Has a full reboot ever been successfully accomplished in the DCU?
The only ones that could be judged as success stories were John Byrne & George Perez's reboots of Superman and Wonder Woman, both of which brought in a lot of new readers and creativity, but neither really sustained themselves for very long before requiring another reboot, and caused countless headaches with other characters (Donna Troy & Legion of the Superheroes being prime examples). It didn't help that most of the stories following the departures of the reboot's creators were preoccupied with bringing back elements of the pre-reboot mythology.
They tried rebooting Warlord. That flopped.
They have just rebooted Ragman.
They rebooted Hawkman, twice.
Legion has been rebooted three times.
Virtually every character that was rebooted during the New 52 has since reverted to their former incarnation.
So, why does DC think that full reboots are the way to go when they have never proven to be a path to sustainable success?
This is not to say that retcons and revisions should not be regularly employed to get rid of the barnacles that build up around these decades old characters, but why does DC keep going back to the full-reboot well when it keeps failing to deliver results?