Ferrules are used to keep all strands together, because some would splay out and short to adjacent terminals. It depends on how skilled the people are doing the panel wiring, most don't even notice loose stands
For screw terminals, a fork crimp-connector is used. A ferrule ends up getting pinched under one side of the screw which does not stay tight and they fall out.
I don't see ferrules used as much in North America. People go straight with stranded wire into a DIN-rail terminal block because the ferrules are extra labour and cost, but don't offer anything when mated with a sliding cage-clamp terminal block.
After seeing aluminum ferrules and some cheap ones very thin metal, I decided they are just another failure mechanism, unless they are a good brand matched with the right crimping tool, and right for the wire size.