Why do authors love amnesia arcs so much (⊙…⊙ ) if they really want it, we can just ...

Why do authors love amnesia arcs so much (⊙…⊙ ) if they really want it, we can just give it to them, no need to rope in our couples...
(Nandadamay eh! Pigilan nyo ko, hahampalusin ko na to...)