The Origin stories will obviously be revealed on your first playthrough because they are also companions. Why would you replay as any of them?

Your own PC you can replay because it's a brand new character every time. Origin characters will just be more of the same.

I just think the whole Origin concept is a huge waste of resources. And it sucks because we already know too much about them as companions before even meeting them. Their background and secrets are just blurted out in char gen description.