I am not here to criticize!!
Could this have stemmed from target fixation?
It is apparent from the report that the captain was concerned about the localiser capture issue, and referred to it for a little while after.
This could have been the single factor that led to the loss of situation awareness and the subsequent inability to regain it throughout the higher workload.
Target fixation is such a natural phenomenon, if you add extra factors such as stress it is so easy to completely lose SA.
An eventual safe outcome none the less by the crew and no-one hurt!!