Wig Wag, Thanks for your comment. I think that the subject needs an enormous amount of attention. It is looks as if airlines no longer look at 'the big picture' as managers like to say.
Since each 'manager' is looking at an ever narrower area, as long as the criteria that they look at are met - no problem.
I am one who could easily work regular night shifts but am lousy at morning shifts. When I have to get up early (anything before 09:00!) I am well below my best. I have changed my lifestyle to suit the way my body operates. Others may not be able to do this.
By the way, as you probably guessed, the list of actions I set out - was entirely tongue-in-cheek. Mondern managers will never take action until forced to. It is cheaper to allow the mistakes to happen and then fix them - than to prevent the mistakes in the first place. This is standard across almost all industries now. The problem here is that people are more likely to die.