This change was made in December (A320 fleet) for commonality with the A350 - presumably so the CCQ courses can be shorter.
I assume that the 350 needed to get down immediately to meet cabin altitude certification requirements - rather than wait a few seconds sorting stuff out then going down.
Obviously airlines are slowly modifying their procedures to catch up with the manufacturer's recommendations...
Last edited by compressor stall; 25th Feb 2016 at 08:33.