I'm believe the most valid use of AI/ML is to perform tasks that people either cannot currently do, or cannot easily do. For example, ai-based up-scaling of old video game pre-renders. It's not really feasible for a person to do this well, unless you simply rebuild everything with a team of artists. And you could argue that up-scaling images for a video game is trivial, since all video games are trivial. But, the point is that the task at hand requires the help of a computer, whereas a to-do list, or using a light switch does not.