Given how safety conscious many European countries are, especially Switzerland, I think it speaks volumes that they still use hook and screw couplings on standard gauge goods trains.
It does not speak volumes at all, the Europeans (including the Swiss) and English made the conscious decision to stay with buffers and screw couplers as they neither had the money after the two World Wars, nor the resources to gradually convert the many thousands of loco's and wagons that cross borders every day. Look at how many years it took to convert all loco's and wagons in Australia and the long term need for transition wagons, then think of Europe and the UK (particularly pre BR) and multiply the tranisiton problem exponentially.
And at the time of transition from screw to auto couplers, Australia and North America were lucky in having essentially captive systems, either because of the states or private networks, Europe and the UK did not have this to anywhere near the same degree.
Then once you have got through that, think of the exceptionally strong rail unions and the employment issue with screw couplers versus knuckles and Scharffenburg. There was and is a very strong social need for the Eurpoeans to maintain employment, where otherwise the level may consistently be about 10 or more percent. Nevertheless the Europeans have enthusiastically adopted the Scharfenburg couplers for all passenger coaches and units.