Easy to produce, doesn't go bad, somewhat light, can be produced on site.
You lose quite a bit of energy making the hydrogen (around 50% I think) but the claimed positives make this not that problematic. If it's possible to create a lot of energy somewhere remote, making hydrogen there and shipping the hydrogen out can be a good idea. Also making hydrogen when there is unused electricity and storing it for further use when energy is not available (night, winter)
You lose quite a bit of energy making the hydrogen (around 50% I think) but the claimed positives make this not that problematic. If it's possible to create a lot of energy somewhere remote, making hydrogen there and shipping the hydrogen out can be a good idea. Also making hydrogen when there is unused electricity and storing it for further use when energy is not available (night, winter)
There are many other drawbacks - I'm no expert.