Sometimes on occasions like this event, the captain should use his airmanship and conduct the approach personally. There is a tendency in Australian airlines for the captain, once having given "the leg" to the first officer, to show great reluctance to change his mind, no matter if the weather conditions have changed. Few captains will ever admit to this though. They feel it is wimpish to take back the leg.
They can rationalise as much as they want - but it often takes a bit of moral courage to say to the first officer "Sorry about this old chap, but I have control for the rest of this leg." There will always be sulky first officers who see this as a slight against their perceived "professionalism" and have no compunction in making their feelings known about the captain's decision. That shows poor discipline and that type of personality is usually a pain in the neck. Eventually, seniority means they become captains and heaven help their first officers after that happens. We have all seen this happen
In another era, the captain was expected to act as the captain. A first officer may be offered a take off or a landing - but the question of him flying "a leg" never arose. The game changed when someone invented the neutral terminology of PF and PNF or PM whichever. The word "captain" almost became a dirty word. Emasculated even.
Times have changed. And now, rightly or wrongly, depending on which side of the throttle quadrant you sit, we accept that it is a 50/50 split of 'legs` For all intents and purposes, the first officer, no matter his experience level, becomes the PF or captain and is encouraged to make all the command decisions while the real captain sits somewhat uneasily in his new role as PNF or co-pilot.
With the introduction of CRM, which, though designed as an a hint for captains to bring his crew into the decision making process, there were unintended consequences. Emboldened by enthusiastic non-pilot CRM authors and lecturers, a more aggressive attitude by first officers was encouraged. This may explain the reluctance by captains to assert their command authority and take over control of the aircraft from the first officer if circumstances warranted it
The cockpit is not a democracy. One man has the legal authority for the safety of the aircraft. If the captain is uneasy about conditions ahead and in his conscience feels he should take over, for whatever reason, (storms ahead, crosswind getting up, low vis, heavy rain over the airport, then he has a moral responsibility to act on that feeling and simply say "taking over". It really doesn't hurt at all.
If his first officer screams "FOUL" then stiff...