Actual companions, as characters with a defined personality that play a role in the story [...]
The so called origins are the top notch definition of this, which makes it hard to follow the argument tbh.
In fact it seems like you aren't following it at all.
This is not a thread against the existence of "Origin characters". Not even close.
This is an argument against the idea (hinted with the AMA yesterday) that they are supposed to be ALL the companions in the game.