Agreed. I meant 'essential' in a weak sense to include all high stakes medical cases, not just literally life and death. The key thing is that we won't be able

Agreed. I meant 'essential' in a weak sense to include all high stakes medical cases, not just literally life and death. The key thing is that we won't be able to get much benefit from neural implants as an enhancement technology without solving this problem; there's a ton of potential value which will be left on the table because people are reasonably afraid of these risks.