I certainly wouldn't deem the PT-6 infallible, but certainly less fallible the the old IO540........ and by a long shot. that would be why the TBO is 5000hrs against 1800hrs. Just because you have a pair of them doesn't make it any safer, in fact it doubles the chance of an engine failure.
I'm sure if we dig around in Pprune, there will be the same arguments repeated in more than one thread. I am sure that the RFDS would have done a study on the risks involved before they delved into the world of SEIFR.
Now two PT-6's would be a whole different story.
