It's been covered many many times already, but it's just poor wording and poor interpretation of wording (and then a bit of stubbornness) that's led to the "completed" tag on the thread. The game isn't yet complete, the main story may be "finished", but the epilogue is not something superfluous to that. If a book has an epilogue, you don't stop reading the page before it, the epilogue is part of the story, it's the "happy ever after" or equivalent. And it's definitely not contained in a separate volume, it's right there at the end of the book, looking for all intents and purposes like any another chapter. The epilogue is there to (hopefully) bring closure to the story, whether we have choices to make in it or not.