No one has ever done it is not in itself evidence it can’t be done, only that it is hard.
And my point was-no matter how hard human life extension is, mind uploading is many orders of magnitude harder. The first, it seems likely in principle that we could achieve it if only we knew the right genetic changes to make-now, you may be right that in a thousand years we still won’t work out in practice exactly what they are-but human life extension has a certain kind of theoretical in principle feasibility which could well coexist with practical infeasibility; mind uploading lacks even that level of theoretical in principle feasibility.
And my point was-no matter how hard human life extension is, mind uploading is many orders of magnitude harder. The first, it seems likely in principle that we could achieve it if only we knew the right genetic changes to make-now, you may be right that in a thousand years we still won’t work out in practice exactly what they are-but human life extension has a certain kind of theoretical in principle feasibility which could well coexist with practical infeasibility; mind uploading lacks even that level of theoretical in principle feasibility.