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You’re just waffling on about nothing while still missing the point.
If your protective device doesn’t trip in fault conditions, it doesn’t matter if the earth and neutral are linked, things will just set on fire until the main fuse goes.
What about TT systems where they’re completely separate as well?
Nef
Fair enough, but if an RCD fails (which they do) I would be happy that Neutral and Earth are tied to the same point (somewhere) because the fault current has a path to flow to instead of leaving a case live (the main reason for doing earth continuity tests as part of electrical safety testing). That is unless you are running a floating supply that is not referenced to earth (which we generally don't unless you are working with control systems or some lab applications)