You try painting a freaking star or vines on a curving cheekbone on a breathing, sweating person. Or reproduce an open wound. Or do a full body sculpt, recreating tiny muscle details that blend into the model’s actual skin and allow full body movement. Or mixing up a pigment and adhesive that will not burn your actor’s skin if they have an allergy. Or figuring out before hand how to remove a make up Hell, something as simple as matching a skintone, is an art in itself. It took me until college to figure out how to do my own make up fairly well, let alone someone else’s.
Make up, either every day use or special effect, is art. It is great and highly challenging art. It makes you crazy because, unlike other art forms, your canvas has to breath, can feel pain, and might move prematurely and destroy hours of hard work.
It’s art. There is no argument.