I've asked numerous times in wash-up about Jump Seat policy and was told not going to happen for security reasons.
So now on a full flight, you could have a perfectly qualified observer who is trying to get home and who has undergone intensive back ground checks sitting there without having to interrupt Sir & Madams caviar.
Think they will do it? Well it won't be to help you and I get home ....but Sir & Madam...
Let's see if they 'walk the walk'
f.