Because a statue or a painting made by a human requires you to think about what their intention was and what they were trying to say. And requiring you to think about that, and actually thinking about something which someone else's thought went into, is what makes you a more complete human yourself. The difficulty of understanding it is what makes it valuable.
Taking the distillation or "reader's digest" version of everything makes you more and more reliant on someone else's interpretation, and less capable of parsing the meaning of it yourself. And in the case of AI-generated work, there is no meaning in it to parse. It's just words and pictures. I love going to the movies and eating popcorn and watching dumb words and pictures. But being able to distinguish between enchanting words and pictures (Marvel movies) versus words and pictures that have meaning which you need to deduce or interpret for yourself is the beginning of being a fully realized conscious being.