Hi Judd: I mis-wrote. I meant to say the ND. The reason is observing the Track Line. Personally I fly raw data with APP Mode on ND. Dirty great big CDI with a track-line for extra measure. You see the LOC deviation displaced and the track-line tells you exactly how much to correct. Also the track-line tells you, in advance, IF the LOC is going to deviate. It's marvellous.
I see the students reacting to the LOC deviation on PFD other than being proactive using the track-line on ND. That is my observation. Even if they use MAP for an ILS the track-line is still their to give vital information. You just need to look at it. Back to training. If they haven't been told what/how to do then they do not it.