There have been numerous incidences of aircraft only just crashing ie crashing into a mountain just below the summit.
The purpose, as I understand it, is to make the reaction to ANY GPWS warning immediate and without hesitation. It might just save your life.
The distinction in response is delineated by whether one is above or below MSA.
But hey, feel free to criticise BA, co-pilots or anything else but please make sure that a) you are a pilot and know what you are talking about, b) have perfect procedures in your outfit and c) never make a mistake yourself.
I take it as read that 411A is OK on all three counts and will no doubt feel able to add some more constructive comment.