No no no no. You are misunderstanding me. When I say read two routes at the same time, I mean read a part of one, then read a part of other, read another part of one, then read another part of other, and so on. Not like simultaneously, literally at the same time.
I've heard some people saying Saya's route was sadder than Refrain. Maybe you just think differently, but I wouldn't consider anything written by Maeda 'not adding much value'