J. O.
I know something of the genesis of the PMA / split approach philosophy and of how it got into the ALAR document in the first place. Let's just say that politics and influence won the day, rather than good sense. In my personal opinion, it remains one of the strangest notions I've ever seen in aviation, especially in a highly automated flight deck.
When did it first appear in the ALAR document?
I ask because the split approach (Monitored Approach) was SOP in BEA when relying on instruments after passing the holding or main approach beacon by the mid 1960s.
The BA decision to adopt and adapt the BEA procedure following the merger wasn't universally popular, to say the least, according to Capt Hugh Dibley who BOAC/BA pilots of a certain age here will know. He told me the story (many years later) in characteristically strong, and amusing, terms.
Please excuse a question which is not directly on topic, and from someone who isn't a professional pilot.