In the accepted answer to this question : What's the difference between "in itself", "by itself" and "in and of itself"? it is stated that
in itself means "not needing other things".
in and of itself means "when considered in isolation".
But don't these mean the same thing ? If something is considered without needing other things ("in itself") then surely that also implies that it is being considered in isolation ("in and of itself"). I don't get the distinction, and whenever I hear "in and of itself" it seems unnatural and I can't see that anything is gained from using it, over "in itself"