Do you mean in any case or just if the reason for dismissal reaches the threshold for being struck off? For instance, a data breach can potentially equal gross misconduct but I doubt would mean someone could or should never work as a nurse again in isolation. Surely more nurses are sacked than struck off.
Re jumping before being pushed, I understand you but this isn't always an admission of guilt.
Someone could decide their MH isn't up to an investigation, there could be bullying skewing the evidence, they could know they didn't do whatever the issue is but the evidence looks terrible.
I'm not sure about the ethics or legality of applying a serious disciplinary procedure which striking a clinician off is, without a fair investigation, even a lapsed practitioner with an outstanding disciplinary.
And I'm not sure how fair the investigation would be, essentially reopening an old disciplinary years after they'd left and chosen not to pursue it at the time. Would they still have evidence etc, would witnesses be likely to have moved on/ not remember what happened.
For most cases we wouldn't be talking a criminal issue, just work mistakes.
Saying 'you have to complete an investigation either locally or with the NMC or you'll be recorded as struck off either way' feels like asking for trouble to me procedurally. What if someone was genuinely taken ill or had family issues during the investigation (bear in mind these are not always recognised for compassionate purposes)?
Those jumping or being sacked may accept not nursing again but I'm not sure every possible person in this position merits the ignominy of being struck off the register.
Sorry for essay!! You made an interesting point and I started musing on it