Hi autumn leaves! The sodium hydroxide solution (lye) reacts with oil to make soap. So while it is very corrosive on its own, soapmakers calculate their amounts of oils/ so that once the soap is ready there is no more sodium hydroxide and a little excess fat (super fatted). If you've ever gotten bleach or ammonia on your hand, you would know that it feels kinda soapy on your skin. Thats because the bleach is reacting with the oils on you skin to make soap!!!!
As for people using conditioner before shampoo bars, I do this but I only put conditioner on my length (ears down), and keep it there while I shampoo my scalp. This way the conditioner protects my ends from the soap. I do this because if I use shampoo bars on my length it doesn't feel very nice (waxy, stringy), even after ~2 months. But by all means if your hair likes being washed with shampoo bars all over, don't stop.
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