So? Musk's batteries are the entire definition of a disruptive product. They're certainly not better than most energy solutions, but it'll be cheap and useful

So? Musk's batteries are the entire definition of a disruptive product. They're certainly not better than most energy solutions, but it'll be cheap and useful for a non-trivial sector of the market. We haven't even begun to see the real advances in economies of scale for batteries, let alone the technologies that have been in development in the last decade.