Are CSD's really allowing the most junior/inexperienced crewmember to do one of the toughest positions on the aircraft, when there are vastly more experienced crew on board who would be able to do it better - but just don't want to because it's hard work??
Are CSD's not permitted to allocate working positions?
CSD are permitted to allocate working positions but in BA cabin crew choose their working position according to seniority (in case you didn't know that). CSD can move crew around if they have a reason to do it but in my 13 years in BA it has only happened when two of the most junior crew have been left with the positions on the upper deck. Some CSD don't like that as they want experienced crew up there.
Is this a widespread practice?
No.