The question is not really whether such and such implementation is best. The question is, does changing implementation preserves subjective identity?
I bet many people here would not doubt the moral value of the emulation of a human (feelings and such are simulated to the point of being real), but would highly doubt that it would be, well, the "same" person as the original.
I bet many people here would not doubt the moral value of the emulation of a human (feelings and such are simulated to the point of being real), but would highly doubt that it would be, well, the "same" person as the original.