There needs to be both, and there was
both, but that doesn't mean they need to be of equal importance. At the end of the day, if you have to choose one or the other to wrap up, I choose characters (at least for this show).
Could the writers have done a better job explaining the mythology? Yes, but they chose not to. Some people call it a cop-out. Other people call it lazy writing. And there are people like me that just don't care. I thought the story ended nicely for the characters, and at the end of the day, they are the things I care most about.