One thing I didn't get was why the machines didn't just make Titan sentient again. It was made clear that it wouldn't be the same being that was created the first time, but by White-Blue's standards, is Titan any less of a slave at the end of the book than it was at the beginning? Yet somehow it's not an issue anymore.
Don't get me wrong, I loved the book, but that's the thing that stuck out to me.
I think at the end end, White-Blue understands that it does not really have the right to make that decision unilaterally like it did the first time. The crew on the Titan have to reach that point on their own.