I'm guessing I'm in the minority here, but I believe what I wash my skin with can have health implications, both good and bad. Skin is the largest organ of the human body. IMHO soap does stay on my skin long after I shower. If soap doesn't stay on my skin why do I smell it on my skin the next day? Why do my clothes smell like soap on laundry day, many days after I wore them? I'm thinking about the things that show themselves on my skin after touch them, things that you can see. For example, we have a lot of black walnut trees. Peel a couple black walnuts without gloves and you will see their impact on your skin for a week (even bleach won't remove it). Soap doesn't typically have dye in it so you can't see what is left behind, but plenty is left behind IMO. At least my nose seems to think so, and the lack of dry flaky skin after using a good soap seems to indicate it is doing its job long after I take a shower.
I lived in Berlin when Chernobyl blew. I had to laugh when they (government and media) advised taking a shower if you got caught in the rain. Oh yes, showering will remove radiation from my skin (sarcasm)! My skin is a living breathing organ that quickly absorbs moisture, vitamin D from the sun, oils, and nasty chemicals. Why wouldn't it absorb the properties of my soap? I use soap 1 or 2 times a day on my entire body -- 6 or more times a day on my hands. I don't casually dismiss the things that are constantly in my "bubble" (pun intended).