yea, but batteries are still quite expensive (I mean on a grid scale) and the cost does not get better with scale. Storing H2 is much cheaper and will also probably scale sublinearly (simplified: you pay for the wall of the tank and the wall is only volume^(3/2)). Also, h2 can be transported, traded, ... whatever, batteries are impractical for this and cables also have limitations.

However, I see one big down to hydrogen. You can't tell how it was made, you rely on a promise that it's green, while it may actually be from methane... maybe with carbon storage, but you never know when that is gonna leak out. This might be a big loophole for fossil fuel corps / states