It's talked about because the sources are intermittent. There will be large price swings in the grid of the future; hydrogen can act as a source of dispatchab

It's talked about because the sources are intermittent. There will be large price swings in the grid of the future; hydrogen can act as a source of dispatchable demand. For dispatchable demand you want a reasonable application with minimal capex per watt (and also low fixed opex), and hydrogen fits that bill. What other application do you think has as low a capex per watt as electrolysis? Maybe heating thermal batteries? But that's not useful for long term smoothing. Data centers have something like 100x the capex/watt of hydrogen.