Well done SA - and all the other airlines that brief this aspect of "self-help" SEP properly.
As a casual observer ( aka "commuting crew") it's always interested me to see the response from pax sitting in these rows when told of
their responsibilities and also that they cannot now stow their 15 items of handbaggage under the seat in front of them.....the usual grumble is then along the lines of ".. I only wanted this row because of the leg room, don't bother me with the other ***".
Perhaps these facts should be made clear at check-in, or better still the row reserved for positioning/commuting crew