Nope. You pretty much have it covered. Hydrogen was very appealing when battery and hydrogen storage both needed significant development, but batteries have come a long way while hydrogen storage hasn't moved much, if at all.
[0] https://news.northwestern.edu/stories/2020/04/gas-storage-me...
Fuel cells and hydrogen storage will benefit drastically from increased R&D and economies of scale. Something as simple as thinner membranes and catalyst layers will dramatically reduce cost, but until recently there has been minimal effort in such ideas. Same is true of just having more production facilities.
There are numerous new ideas being explored for hydrogen storage. Only this year has someone figured out how to make a true hydrogen "battery" for you home: https://dlmag.com/lavo-hydrogen-hybrid-battery-stores-electr...