content: The problem with the Singularity is the complete loss of self.  The quantum brain in a person's head can be one's "self" only so long as the quantum states therein remain alive, and coherent, and originate from the self.   Complete machine entanglement means the original self is gone (or is such a small part it doesn't matter), and has been replaced.  The "one" of the singularity is just a single organism with a lot of memories and processing power, while the constituents have been absorbed and are gone.   I see the singularity as a grand scale suicide.