I believe my comment was in response to your facetious suggestion that the logbook should only be completed after the fact. Since most log entries are made after the flight is completed, the wink suggested to me that the absence of a log entry would somehow influence the outcome of some followup action related to an unforeseen outcome of the flight.
The context of the thread related to flight training vs other operations, and insurance coverage related to training. Having BTDT with numerous prior events, the intent of my post was to point out the fallacy such an approach. YMMV