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I always thought of technologies like these as potential solutions to the grid-storage problem: excess solar and wind energy can be put into electrolysis, and then the metals can be burned to provide base load power — while keeping lithium for portable use-cases

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I would rather use a process that uses more abundant elements and can be used to (re)produce electricity directly without burning: https://news.ycombinator.com/item?id=37548917 Generally, it is a good idea to lower the temperature needed to produce your fuel as that usually is just waste heat. Melting iron oxides needs very high temperatures which makes everything more complex.

Still magnitudes less efficient than just building gravity batteries.

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