Perfection comes from experience. Truly mastering the art of mens grooming takes years of practice. G&D has been an establishment in Beverly Hills since 1936. A Gornik & Drucker shave is not something you can speak about until you experience it for yourself!
An oil is "essential" in the sense that it contains the "essence of" the plant's fragrance--the characteristic fragrance of the plant from which it is derived. Essential oils do not form a distinctive category for any medical, pharmacological, or culinary purpose.