~~The live and neutral ports commonly lack the shutter and~~ the fuse is not always present (edit: on low power devices). Some devices for whatever reason also feature a plastic earth prong which serves only to release the shutters to allow a connection. ~~And if the earth is not present or is broken then the plug will sit loose in the socket.~~ Another "feature" of these plugs is that they lay flat on a surface and hurt to step on.
Otherwise they serve their purpose really well.
Turns out I was wrong on that one. My bad. Some of them don't really look like they have shutters but apparently they all do and it's enforced too. I guess that makes even more sense why there are those plastic earth connectors on some plugs then.
Well it turns out I don't know what I'm talking about at all despite using these sockets every day. They're a lot more technical than I realised. Shows what we take for granted I guess.