It is true that you will not get the same properties from using oils in CP verses applying them on your skin like a lotion, because the properties change when added in CP and you can’t get any of the essential vitamin or healing properties out of them in soap. But they do add different properties in CP, such as more creaminess, or lather or silkiness or moisturizing. For me, I notice an extra silkiness from adding Castor, and I notice more moisturizing and creaminess when adding Shea butter. other oils may take away from the foaming lather, like the heavier oils, but lighter oils like sweet almond and sunflower, i dont notice less lather. for me I get less foamy lather when i add kokum or cocoa butters