It would be interesting to hear from some european crew on this.
Can't say for them, but in Oz the Qantas group (QF, QL, and Jetstar) ask to see boarding passes at the aircraft door. Not sure about
VB and Rex, as I've not paxed on either for years.
But if this thread was in D&G, it would have lasted about 5 posts, because over here no-one (pax or crew) really cares if we're asked to see our boarding pass another time.
We care about more important things...
Like Footy
(Aussie rules and rugby, not that round ball rubbish)
and Beer
(Ice-cold, thanks, and NOT Fosters)
and White-pointers on the beach, etc.
DIVOSH!