FL - my reflection upon the RAeS event was just that. I reflect my view, nothing more. You may have a different view / different focus. Ultimately if there was a clear and consistent view I guess there would have been no seminar...
The Moth case was an interesting introduction to the subject but actually my summary of the same is that the outcome had wider points of debate than merely the use of AAIB material in a court of law. Not least the fact that a reports content may reflect safety recommendations that are subsequently of dispute in court.
One also wonders if events are in debate if interested parties raised points pre-final report.
Or you can turn it around and in the case of the Moth I'm not sure how flight safety is compromised if one agrees that control restriction was the primary issue and that had been reported definitively in an AAIB report.