Concerning atopic eczema why do ALL pharma paraffin and chemical based creams and ointments just sit on the surface of skin doing nothing beneficial?

Sealer. When you have atopic eczema, your skin cannot keep the moisture and thus you need to bathe regularly and then apply the moisturizer on the skin within 3 mins to try to seal some of the water in. The oil acts mainly as a sealer which is essential in controlling AE (AD). Most people needs 2 applications daily if not often. There are other anti-inflammatory topical products - see your doctor.