Lots of others apart from LHR would not make a 300m standard, especially in the US. All the same, LHR is antique and there are all sorts of things you wouldn’t do now that might have been done then. IIRC the top of the LHR Renaissance hotel very nearly got dinged once or twice.
It is not so much the frequency with which bad crashes happen in the overrun areas, although there seem to be a helluva lot of them, but the ease, in places other than LHR and other antique sites, with which you can avoid most of them (e.g. ditches, berms, sunken roads etc.), whether or not this crash was a case in point.