I think a little bit of that was bitterness on Aonuma's part.
He's been very public about how he really wants to create a Zelda that tops Ocarina of Time. Ironically, the closest he's ever been was Majora's Mask. Although not nearly as epic as Ocarina of Time, Majora's Mask was just brilliant and featured a engrossing atmosphere, evocative themes, and amazing music.
It still amazes me how Majora's Mask was centered around a completely optional event that takes place during a side-quest in Ocarina of Time. I never got over how awesome that was.