Shepp, when the weather is really, really crappy the F /O will be driving it via the autopilot; something most F/Os seem to do even better than Captains. Particularly on a non precision approach, I find it useful to be looking outside about a mile or 200 feet to MAP/MDA. Getting right to minimums then looking won't allow for a stabilised approach in some places on a dark night because there are not enough cues or there is not enough distance to the threshold.
The F/O is primed for a go around, and this is also often better executed by the guy whose head is still inside.
Most doubters have either never done monitored approaches, not done them with a competent crew, or never landed in sub 800 metre visibility conditions with any degree of regularity.
Single pilot is another subject to this. King Airs and the like really don't need to be fully stabilised until about 200 feet, if at all in skilled hands.
But in this age of big brother monitoring, there would probably be less reports of high sink rates, tail strikes and heavy landings if monitored approaches were more universally applied in marginal conditions. I wonder how BA stack up against similar sized operators flying in the same environment?