Like a lot of other people I didn’t know they are actually full electric and that they convert hydrogen to water to create the electricity, instead of having lithium-based batteries.
They have the advantage of very fast refueling (because the fuel is liquid) but the disadvantage of not-yet-developed infrastructure (just like battery EVs were a few years ago)
Three years ago, everyone in my home town would mock EV cars with comments like:
What do I do if I have a 100km trip to do and the fueling station is 150km away?
Do I start asking people around, “sir, please, can I borrow a car charger” like it’s a phone?
Some want them because they are quiet, some because you don’t pay CO2 taxes on them. Some even like EVs because you can charge them at home (which is another disadvantage of hydrogen cars).
Nevertheless, both battery and hydrogen EVs are improvements that we need in the future and we have to understand that there’s always a transition phase for new technologies.