That is SOP for some airlines. The First Officer is the flying pilot and head down all the way to DA. The Captain assesss the conditions at DA if suitable to continue with enough vizual ques to land, the Captain then takes over and lands.
If the Captain does not have the required ques he calls the GA and the First Officer flies the missed approach.
The First Officer is always head down and the Captain is scanning outside for visual ques and aircraft positioning.