I believe why it's so dangerous is because when you split the water... you get both the hydrogen AND oxygen... ready to go as is... whereas most other fuel sources won't go off till exposed to air...
I remember filling a sealed canister up with straight hydrogen once, punching a hole in the top and bottom... as the hydrogen escaped out of the top(it's lighter than air) we lit it like a fuse... until the interior of the can reached the proper mixture of gas to oxygen, it would not blow... when it did however... it made a hell of a boom!
Not something to play with at all, this was done in a lab... controlled environment
The safety aspect is probably another BIG part holding them back...
It's like having a little bomb in every car on the road
Sounds like fun
I've seen video of controlled catastrophic failure of hydrogen cylinders in a car... yes a good fireball, but if you split a gasoline tank and through a match into it... the hydrogen burn off doesn't seem so bad...
