Don't have anything to add here, but wanted to plug Nocturnes, a collection of short stories. The one other fiction he's written that's not listed here, I believe. It's very good, like everything he's written. He's a remarkably consistent author. Rewarding to read all of, and very manageable as there are only the 6 or 8 (don't have the list in front of me and not going to look it up) books.

Liked your point about order mattering, because he does have a pattern. Once you've read one of Never Let Me Go / Artist of the Floating World / Remains of the Day, you know what to start looking for in the other two. His other books are patterned a bit differently. Buried Giant is probably the most obvious (except for the end, which I still haven't quite worked out). A character states the titular point. But I like that the novel makes the obvious macro-point secondary to the micro-level experience of the main characters.