Indeed it does, but few people (probably not even BAS) are perfect so, if it is fairly easily done (with minimal cost, in the widest sense), it probably makes sense to implement things which either over-ride or remind them about their 'oversights'.
One also has to consider what one regards as 'waste'. If we were prepared to wear 'outdoor clothes' in our homes and retire to our beds throughout the hours of darkness etc. etc., we could dramatically reduce 'wastage' of energy on lighting and heating our homes - but I don't think that many of us would want to do such things.
Kind Regards, John
Leaving lights on when no one is in the room - waste.
TV on and no one watching it - WASTE.
Excessive amount of tomato sauce on dinner plate - WASTE.
Bread not being eaten and not put in freezer - WASTE.