While Birthright's story is just boring and Conquest's story is just stupid, Revelation's story is just a slap in the face to anyone who was willing to take Fates' initial premise seriously.
Do you fight for the family you were born to, or do you stick with the only one you've ever known? Neither Birthright or Conquest were able to answer either question in a satisfying way. And as for Revelation's answer? Eh, who cares! It's "Everybody Loves Corrin!"
It's a route that caps off a game filled with moronic characters and a story far too scared to have any real consequences.