Came here to say this. Both Seveneves and Fall have long unending psuedo-epilogues which add little to the main story, but also don't really wrap anything up satisfactorily either.
And, even if you accept how they got there, the last part of the book just wasn't very compelling for me.
That last part almost seems like a form of trolling, the smallest viable story to claim "I had you on a sidetrack all the time and you did not even notice"