So interesting piece of information. N=1 so take with pound of salt but here it goes;
According to a Virgin ground grew I was chatting too, they said it’s ‘at their discretion’ now and they board as they see fit.
Interesting point followed from them. They also said ‘most priority people sit at front and we almost always board from front and back doors these days so most gate staff scan both lines at same time now because it’s much quicker as we find most non-priority people take the back stairs anyway’.
This kinda makes a little sense to me in terms of potentially being faster…(although I do disagree from a premium FF benefit dilution point of view of course!).
So, this new method as others have indicated may well be to try and speed up boarding, and try to improve OTP…
Just passing on, don’t flame the messenger!