Ugh, hydrogen.

Hydrogen vehicles are the magical combination of expensive to buy and expensive to run. They just get mothballed when trials are over and the funding runs out making the whole thing a waste of time and money.

Battery electric vehicles are cheap to run so they get used for whatever workload they can do, even if they can’t do the most demanding jobs yet. BEV bus can’t do the longest route all day? Put it on a shorter one. It’ll get used for something.