I guess the case against the boarding card check is now dismissed given all the experiences on this thread?
Not by Lufthansa apparently. Two LH flights this week and still no interest at the door, nor from Air Malta on one sector, despite the high levels of righteous indignation on PPrune
However Egyptair (a Star Alliance member) did check on both sectors.
Anyway, the 'case' for the check for UK airlines is clearly that it is the law to do it, there is no option.
As ever, I am quite happy to go along with the airline's procedures, show BP or not makes not a jot of difference either way.