Originally Posted by
Johnny F@rt Pants
No real need for it to be honest. In 13 and a bit years of operating the B737 with Cat3A fitted I've never needed anything other than that. Visibility so poor is so infrequent it's an additional cost for very little gain.
I have been flying the NG for about the same time and have had exactly one diversion when 3b would have got us in. Having said that, the newer NGs are significantly improved, although an autoland go-around above alert height single engine flaps 30 (if you have the authorisation) is a pretty demanding manouevre.