Natsume should delay the games because they want to POLISH THEM, not sales. I am a fan of the harvest moon games but they always lack that extra polish. Clipping problems, less than perfect translation, etc have always been a problem for the games that I played.
I bet they are cursing themselves because having it release later with other high quality games around them, this game will not be comparable in polish and quality. Gamers expect more with more time, and if they are going to delay it and not improve quality they will not see better sales even if the user-base is bigger who owns the console.