LOA161 makes sense from the companies side as it gives them flexibility with the cadets going to different outfits as part of industry placement, and gives them the freedom to try to extend the cadet placement when suitable, without having to deal with any fairness issues for that particular cadet course.
As far as the guys who are on the line for a few years and then have courses coming in over the top of them, LOA161 stinks. Even as a cadet I still disagree with how it works.