Hiya Sully, how goes it?
I want you to know that I totally agree with just about everything that you just said, and that we're pretty much on the same page.
I do have a strong feeling that the bearing wouldn't have spun if the engine had a top-quality synthetic in it, due to the superior cold-weather characteristics of synthetics, but again, I could be wrong. And I agree with you that there are morons everywhere who shouldn't be allowed to operate a can opener, let alone a D8 dozer. It's just a sad fact of life that morons are everywhere, and the particular guy who owns that ill-fated D8 has no choice but to delegate responsibility to some of them. To me, that's just one more reason for him to cover as many bases as possible and run synthetics in ALL his stuff, so things like this will be less likely to happen.
The one part of your post that I would like to gently disagree with you is where you say that synthetics won't increase the life of an engine at all, all things being equal. (No morons, proper operating practices, and proper maintenance. And I agree with you about not extending drain intervals when using synthetics - get the crap out of your engine, I say).
It just seems to me that in the long run, using (top quality) synthetics as opposed to (top quality) conventional oil will decrease the wear on engine parts, for a variety of reasons, but also just from improved lubrication at start-up alone (cold weather or not).
Again, it comes down to economics. Is it worth it? There's the debate. But it just seems to me that the (seemingly indisputable) "fact" that synthetics are just plain better at doing the job that a lubricant is supposed to do has got to result in reduced wear, and therefore extended engine life.
If I'm wrong, I'm wrong. I'm always willing to learn, and I love getting at the "truth".
John