It is not trivial to store hydrogen. It takes a very large and expensive tank to store it at any practical level.

And it has a tendency to leak through most materials.

https://planetforlife.com/h2/h2swiss.html#:~:text=Hydrogen%2....

"B&E estimates that a liquid hydrogen tank designed for automobile use will loose about 5% of its capacity every day, which is to say that all of it will be gone in 20 days. Losses of this magnitude are acceptable for, say, a taxicab fleet, but unacceptable to most people."

Also new to me that it's a greenhouse gas: "Hydrogen cannot be vented to the atmosphere because it is an explosion hazard and because it is a greenhouse gas. The vented hydrogen must be burned. A continuously running gas stove with one burner set to "medium" would do it."