Anyone that has ever had to deal with hydrogen knows it's leaky. Can that be overcome yep, not cheaply though.
I'm sure those words were spoken about propane, natural gas and maybe even pocket cigarette lighters but it got figured out. Back in 1999 I was in Munich, Germany and saw several hydrogen powered BMW's running around town and the very strict Germany TUV and government didn't seem to have a problem with them. It will get worked out and be just as safe as your propane gas grill, gas/propane stove/oven, gas/propane HVAC home system and be much more convenient than charging a battery. Hydrogen/EV hybrid is the real future IMO....it's not too far around the corner.
Gee, back in 99 you saw some hydrogen vehicles running around, here it is 2+ decades later and still none in production. At that rate if they ever solve the issue we will all long be dead and some archeologist will be digging us up as specimens.
I used to work in semiconductors and we used hydrogen for various things. We already know how to seal it, but it's not cheap. Heck, what powered the Saturn rockets into space when I was a kid? Hydrogen. Problem is that hydrogen is the smallest atom out there, so it likes to leak. You can't say that about propane, natural gas, butane or any other gas.
The issue isn't safety, hydrogen dissipates faster than any other fuel out there. The issue is not having fuel because it leaked away on you if everything isn't perfect.
