In fact, the thin substance in the film volatilizes into the atmosphere, leaving only a thin layer of filler. If you rub it carefully with your fingers, a film will appear.
Some skin care and beauty products will also add some oily diluents, which will not completely volatilize in a short time, and you will feel oily. The advertisement calls this "moisturizing".
Liquid and pasty objects are likely to be absorbed by skin after contact with hair follicles, and the real skin absorption is very small, less than 500% of the total, not counting the capacity of hair root pits. But the effect of beauty products on absorption is not the actual physical quantity, but the user's confidence in advertising. If you believe that it is completely absorbed by you, then it works best. Because it's mainly psychological.
As for whether there are disadvantages, I think even if there are disadvantages, they will not appear immediately. In recent years, the manufacturers of these items have also learned well, trying not to use materials that are irritating to the skin, and trying to call the PH value neutral. This will at least stop disfigurement. Because the highest standard in the beauty industry is "no disfigurement equals beauty"!