I think that + it's an EV that Toyota don't have to source the battery cells. FCEVs are full EVs just like Tesla, that uses a different kind of battery than Li-ion.
The point is, it is a full EV. The "hydrogen fuel cell" thing is a type of a battery. A lot of people somehow misses this, and thinks it of an EV-ICE hybrid. It's not.
The FC is a magic non-moving fin stack that generates electricity proportional to the amount of H2 and O2 fed through it. It's a type of a primary(non-reusable) battery. Nominal cell voltage is 3.7V and pack voltage is 370V for Mirai.
Not that it makes the car great, but it is literally an EV.
