I'd like to see an answer to the most pertinent post here, Distant Voice's question about the ALARP statement. From other posts it's obvious that the "reasonably practicable" bit hasn't been pursued with any vigour, with many years between seemingly ad hoc trials. Why no structured approach to 'pulling through' the technology? (It's ok, I know the answer, and it's nothing to do with money).
Meanwhile, perhaps the mods could shut down once and for all those who habitually play the man, not the ball. It's spoiling the forum. Banter is fine, but personal attacks divert from what could have been a tragedy.
Remember, 'rumours' first mooted here have explained many accidents/incidents over the years.