I didn't handwave it off. Nobody had mentioned the cost-effectiveness of chemical batteries in the thread so far. I wrote a 1000-word essay about the issue two years ago, exploring the resource ramifications, which I linked from the above comment, and this other 600-word essay here which goes into more details on battery costs and expected internal rate of return on batteries under different incentive schemes: https://dercuano.github.io/notes/energy-storage-efficiency.h...