Nor, I strongly suspect, have many people - underlining the fact that it is probably an exceedingly rare occurrence.Thank you @SUNRAY this is some thing I have talked about before, but not actually had a case of it happening.
For a fault to develop which resulted in a substantial portion of a heating element being 'bypassed' ('shorted out') without there being any contact between live conductors and their (almost inevitably present) earthed metal containment must be extraordinarily improbable.
In any event, even if that "extraordinarily improbable" happening were to occur, as I have said I would think it very likely that the remaining current-carrying part of the element would rapidly 'burn out' (melt) - before you or anyone else had a chance to see it drawing a very high current. I presume that, like most of us, you have come across 'burnt out elements'?
Furthermore, it was purely by chance that, in the anecdote Sunray cited, the extent of the fault ('shorting out' much of the element) was not quite enough to result in very rapid operation of a 32A MCB/RCBO. He mentioned 5.1Ω, hence about 45A at 230V. Had that (equally by chance) have been about 4Ω (about 57.5A), then a B32 should have operated within about 5 minutes, and if it had been about 3Ω (about 77A), within 1 minute or so.
Hence, not only is a fault of the type described extremely improbable but, even if it does happen, it would only be by chance that it did not result in rapid burning out of the element and/or operation of a B32 - which all adds up to the fact that it is "extraordinarily improbable" that a situation such as Sunray has described will both arise and persist for an appreciable period of time.
As we have both said, the use of 'dual cooker outlets' connected to 32A (sometimes 40A or 45A) supplies has been very common practice for a very long time (and remains so today) - so, if the scenario being discussed were more than "extraordinarily improbable", we would surely be encountering it and/or hearing about it?
As I've said (and as is also the case with bernard), I think we have to ask Sunray whether he ever crosses roads, travels in cars, climbs ladders or uses power {or even hand} tools etc. etc.
Kind Regards, John