I feel like a subset of sci-fi and philosophical meandering really is just increasingly convoluted paths of trying to avoid or come to terms with death as a possibly necessary component of life.
Given rationalism's intellectual heritage, this is absolutely transhumanist cope for people who were counting on some sort of digital personhood upload as a last resort to immortality in their lifetimes.
I liked how Scalzi brushed it away, basically your consciousness gets copied to a new body, which kills the old one, and an artifact of the transfer process is that for a few moments you experience yourself as a mind with two bodies, meaning you have at least the impression of continuity of self, which is enough for most people to get on with living in a new body and let philosophers do the worrying.