Why do you think that is unreasonable?
Do you think OW divers are unprepared? Do you think OW divers should give up at the sign of any situation that they are unprepared for? I think this is a poor assumption or OW Certification has really gone down hill. You pick which one...
Does PADI open water teach students to bring up another diver from a ocean bottom? I cannot recall.
Imagine a dive buddy who has very few dives being stressed and scared, in currents. I just cannot fathom most novice divers being able to rescue the buddy. That assumes that she had not already drifted past the other diver and been unable to swim into the current to reach that diver.