Since they are not complete, balanced groups of molecules artificial fragrances don't quite register with scent receptors in the body and don't offer the same uplifting and reparative value that essential oils can. Many people find perfumes and artificial fragrances to be too strong and to cause allergic reactions due to their inability to be properly 'recognized' by the body. Many natural ingredients also offer the advantage of trace nutrients, small amounts of minerals, vitamins and other components that give an ingredient multiple benefits. A, E and C. Honey naturally helps restore moisture and softness to the skin but also provides important amino acids, enzymes and vitamins. Many natural ingredients afford these sorts of multi-purpose actions in a balanced, synergistic way that synthetics just can't duplicate.
Many natural substances offer some antibacterial benefits.
Certain essential oils, like Tea Tree, and some vitamins can help reduce some forms of bacteria when used in high concentrations and in ideal conditions. Unfortunately, your bathroom is not an ideal condition. Steam and heat help encourage bacterial growth and many natural preservatives can't be used in strong enough concentrations to fight contamination without running the risk of skin irritation. Others are useful only against certain strains of contaminants and for limited amounts of time. Here's a good example - vitamin C will slow bacterial growth, but try leaving a glass of orange juice in the back of your refrigerator for a few weeks.