Fusing neutral is nonsense.
In Spain it is required by the regulations and there are several good reasons. One is that some places are supplied 230 V with two phases from a 127/230 volt system and there you, obviously, need to cut both wires just like in America you need to cut both wires in a 220 V circuit.
And there are other reasons.
Also, there are different ways of implementing and connecting protective earth and a lot of people think there is only one correct way to do it and any other way is wrong.
Again, in my apartment I have single circuit breakers on the phase side but there are good reasons to cut both wires after an overload or GFCI.
In Spain, like most of central Europe, we use Schucko plugs which are an abomination to everything that is decent and holy. Non-polarized, requires great force to pull, earth tabs can bend out or shape or make bad contact, too big.