.. a real aeroplane .. ah, but you also could beat the air into abject submission with your machine, Brian... and I suspect that you assign far too much science to the art of forecasting. Perhaps we should catch up at Jack's for a beer to debate the relative merits of rotary and fixed ...
.. but if the forecast is wrong ? again a matter of risk management and local knowledge. Consistent with justifiable decision processes, the sensible commander will adopt a defensible level of conservatism .. I don't recall many flights to PER with the slightest hint of fog wherein we didn't have a very heightened level of interest in the TAF and we invariably carried enough to go somewhere sensible consistent with payload .. mind you, the Electra was good as we could carry the other side of the planet as an alternate .. the DC9 boys had more than a few anxious moments though ...
I'm all for manipulative skills which include sim work in very low vis .. I routinely practised 50ft/125m single pilot hand flown raw data figure-8 1500 ft touch and go ILS's. Great fun but tiring after an hour or so. That at least gives one a fighting chance if the situation deteriorates to the point of the ridiculous. However, the problem in the real world is ILS integrity near the ground, time to assess at breakout, whether one has enough visual cues to confirm that the bird is, indeed, in the right spot or not, etc. Sure it's fine to risk the blind landing if one is caught out and there is no realistic alternative option .. but only as a serious emergency .. the risk analysis doesn't justify it in other conditions for routine civil operations.