It is much lighter than air. Any hydrogen leaks will float away a lot faster than gasoline.

This is not even wrong.

On the other hand, it burns almost invisible.

The hydrogen cells in production and used in motorsport are literally bulletproof. The type of accident that results in your tank exploding would have to be so severe you would be dead before the gas had time to ignite.

Whether the tank is bulletproof is irrelevant.

Again, whether or not your dead doesn’t change the fact that the tank will explode, not just burn.

The system as a whole is not leak-proof. All you need is a leak in a contained area, like a garage.

Since I can’t edit my last comment, here’s the newest disaster in the news[0]. No need to go through the tank walls when there’s another weaker link.

[0]: https://www.hydrogeninsight.com/transport/exclusive-hydrogen...