"Industry Insider" - you are absolutely correct - the stakes are extremely high - much more so than in a singe incident report. two ditchings and two fatal hull losses in around five years means that the consequences could be very grave indeed. However, as you conceed Colibri49's question will have to be answered at some point - just with concrete evidence to support it. AH continue to maintain that the Pumas are safe to fly, the AIBN and AAIB, for now at least, while they don't go so far as to disagree are insisting on precautionary groundings.
The problem is detailed investigations take time. It may not even be possible to definitively determine the root cause as the evidence to do so may be at the bottom of the sea.
In the absence of detailed evidence people will have to make their own highly subjective judgements - inevitably this has already started ...
https://www.flightglobal.com/news/ar...copter-425041/
For all concerned let's hope it is possible for the AIBN to come to a conclusion sooner rather than later. But as you correctly point out they are not going to be pressured into to doing so without solid facts