I just finished and while I agree with what most of you have said, I have to defend the modern bits. First of all, I don’t feel like there was ever supposed to be a direct correlation between Nina and Sita’s stories. I actually feel like tenuous connection between the two stories is reflected in the jittery animation of the Nina sections and how they contrast with the sleek, hard-lined, gloss of the Sita sections. The idea isn’t that their stories directly parallel so much as the themes of feeling out of control of your own life after a nasty breakup is timeless and how we can find comfort in storytelling. So while I enjoyed the three narrators and I LOVED the Sita parts, I don’t feel like they would work as well without the modern context. As charming as the narrators were, they were really just an exposition dump. And as wonderful as the Sita portions were, you would have had to add dialogue to propel the story which would have spoiled the effect.
I don’t feel like Nina was being egotistical. She was finding strength and comfort and wanted to share that with her audience. She wasn’t comparing herself to Sita any more than I compare myself to Frodo when I read Lord of the Rings. You don’t have to literally carry a ring to a necromancer’s evil volcano to relate to the feeling of being forced to carry a burden. It only matters how we interpret the message for ourselves and apply it to our own lives. And if it grants us some measure of solace or wisdom or whatever then that’s absolutely valid.