I thought that it would be a neat way to reconcile He-Man's Pre-Filmation origins with the iconic status quo started by Filmation and continued by everyone else. The whole barbarian tribe origin from He-Man and the Power Sword would be Adam's cover story about He-Man's origins. It's not really true, but a story concocted by Adam to protect his secret.
Even He-Man has to have a past, a childhood, a place to go "home". Using the Pre-Filmation origin in this way is a great nod to that past, while keeping the iconic elements.