Just a personal observation: ( I did not see the TV program, natdoor.)
The staff at Lidl 'n' Aldi, both of which are German-owned companies are able to multi-task and are better organised than any of the British based 'big-name' supermarkets I have shopped at.
Each member of their staff seem[s] to have the ability to either be store manager or shelf-stacker with ease.
... it must be a German 'thing'.
Das is Gute!