I mean, the end of chapter 6 is the climax of the story. You're not going to have something as gripping or profound or meaningful at the end of an epilogue.
But I feel that in retrospect, the epilogue only ends up serving to belittle the climax the climax of the game. Of course, that could be what they were going for, but I feel like they could have done it better. Abigail crying for John not to go, John going, coming back, and then Abigail being like, "Hey, you did it, yay!" just felt... lame. This may sound weird, but it felt like a video game ending, like you defeat the bad guy, and you're congratulated for it and everything's okay. Of course everything's not okay, but for now, everything is okay.