As current carrying capacity is directly proportionate to area...which is the default pathway in case of fault....what are the consequences of reducing its size and intrinsic ability to carry that extraneous current to earth and away from the user....along the pathway it is intended to travel to save your life.
Hence, by reducing its (current carrying capacity) size safety reduction is implied directly and reduced hugely.
Ever welded in a damp area? That is why no matter what style of welding m/c you use special precautions are needed.
It's your life or anyone you may care about who is at the end of the chain as the current will hit earth through them. Don't tell me that people weld alone at home I have seen and stopped too many examples that are dangerous.
Why argue about the safety? You chaps stated exactly why welders ARE earthed.
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