A and C
Yes, that's true re: EZY, and safety is a lot easier to manage with a scheduled service or pattern, but there are still a lot of commonalities remaining between types, units, commands and arms. And even then, best practice can be developed to apply to greyer situations, based ideally on previous experiences and incident/accident reports.
I think it's interesting that 15ish years ago the RAF would have been hailed as a paragon of flight safety, with Air Clues etc often being sought by civvies for training, and yet somehow it now finds in itself on the back foot in terms of culture to EZY et al - notwithstanding your observation above. I wonder if the next big enquiry will ever connect the shrinking size of the services to narrower oversight mechanisms that became contaminated with ambitious individuals; the latter certainly buggered up a lot of other stuff!