the only reason i can think of, is because our skin needs our natural oils. i use tea tree soap from holland and barratts(uk) and people have said they found it to be over drying. why is that bad if you(i) will moisturise not long after washing ? thanks
It is exactly that: when you are using over-drying soap, you do not just get rid of the oil, but also of a lot of good bacteria that protect your skin and keep it healthy.