You're comparing apples and oranges a bit here. Sure, using a robot to lift weights at the gym is analogous to using AI to create art, if your goal is to get better at being an artist.
But if you're a person with no painting or drawing skills who uses AI as a way to express your ideas visually, it would be a little more akin to being a shitty machinist who uses Sketchup and a 3D printer to manifest their mechanical ideas in meatspace.
99% of AI "art" is absolutely a cringey slopfest, but I'm not going to lie and pretend I can't relate at all to people who use it as a tool to supplement their own practical deficiencies. Whether art should be more about the output or the process is a whole other philosophical debate...