Anecdotally, it is starting to sound like the BA process for upgrades has returned to a more predictable sort of pattern.
Whereas with DUT there seem to be a heavier emphasis on "surprise and delight" passengers who might not otherwise have experienced upgraded travel but who might be persuaded to spend on it again in the future, I get the impression that it has returned to a more regular system of tending to upgrade status passengers travelling alone. I wonder if this is a real change and if so if it was an active decision or a side-effect of some other necessary work-around.