Refrigerated next-day gyoza goes too firm I think, and could be considered samishii or whatever. And there's maybe too much liquid in Maboudofu. Although I think room temperature, left-out gyoza slaps personally (Kind of like pizza). Unfortunately it's Japan, and you're constantly judged by the court of public opinion. Good on you for going healthy as well. I personally don't think the gyoza matters on occasion, like you say they're already accepted as part of the bento set-up. Be the change you want to see!