On 2e: my naive intuition is that for it to count as a "true" IA singularity and not just one of the other kinds of singularity helped along by IA, it'd have to be of the form "Brain-computer interfaces means the minds have both a wetware and a software part, the software part grows much more quickly, and after a while you can just remove the wetware without much of value being lost." or something like that.