Indeed, they don't necessarily - and, anyway, I doubt that, in situations where 'safety boots' would achieve anything, I suspect that most ordinary footware would be more-or-less as good.
However, whilst tradesmen and DIYers do sometimes chop through such cables, I wonder how often it has resulted in significant injury, let alone death - and, whatever the answer to that, one imagines that RCDs have been reducing it even further (from a starting poiint which I suspect was never a lot above 'zero'!).
In all the decades I've been making holes in walls, I've only once hit an 'unexpected cable' - and that was in a wall that I had no reason to believe contained any cables at all. I have, however, on at least two occasions hit (and penetrated) water pipes - plumbers don't seem to pay even 'lip service' to any notion comparable with the 'safe (aka dangerous!) zones' for electrical cables.
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