Agreed StayinAlive that it was sad and shouldn't have happened, but I think you're drawing a long bow with the rest of your assumptions, given that we still don't really know what happened.
While I can't speak for the Kiwi pilot, I can say that the Australian pilot was very experienced in low level survey flying.
If it was a combination of terrain and sun-glare as one of the reports mentioned, then it highlights one of the few shortcomings of the C210 at low-level. That is, it's poor forward visibility over the instrument panel and engine bay, both of which make low flying in hilly terrain in these aircraft an excercise in faith.
Unfortunately, we will possibly NEVER know what really happened and as such no lessons will be learnt.