I showed my grandma (98) a photo on an iPad. Her immediate reaction: “there’s no reason to paint realism anymore”. The method described in this article might work for realism in oils, but please don’t accept it as the exclusive way to create art.
Art is about understanding the tools you’re using to create (for example how paint mixes, moves, dries, interacts with a surface), then choosing which tools to use and how to use those tools to convey an experience to an audience. Art is about experimentation, exploration, communication. Art is about studying & talking with other artists to learn how they work, the processes they use, how they solve problems; sometimes copying them and then extending beyond.
My point of view on this developed as I studied art in high school, through AP art, and then minored in fine art in college alongside my engineering degree. Plus many hours painting with my grandma and my mom.