Another consideration, though maybe not a fundamental one, is that past and future selves are the only beings we know for sure that we have lots of subjunctive dependence with, just from “structural” similarity like calculators from the same factory (to use an example from the TDT paper). Tumblr usr somnilogical elaborated on this a bit, concluding “future selves do help past selves!” An upload is a future self in the way that matters for this conclusion.
Another consideration, though maybe not a fundamental one, is that past and future selves are the only beings we know for sure that we have lots of subjunctive dependence with, just from “structural” similarity like calculators from the same factory (to use an example from the TDT paper). Tumblr usr somnilogical elaborated on this a bit, concluding “future selves do help past selves!” An upload is a future self in the way that matters for this conclusion.