That's obviously not true. When rereading everything from the beginning you can see how everything connect. It's a thought out very well but yes it did end suddenly without any warning
i do read it all for the first time today, because i never read uncompleted series. but still, the story of them in the VR was cut all of the sudden, without any explanation about what was happening there, the meaning, etc just because "it was not real, its just VR" and then suddenly it change into a completely different "story". It really felt unfinished, both their stories in "VR" and in "real life" i feel like im just reading story of them in two different dimension and both just suddenly ends it makes me sad... but still i'm always satisfied with a happy ending.
it really feels like the author just got tired and want to change the story in the middle of writing this... （￣へ￣）