I don't think any average person would know of these advantages. So theres a general lack of education about the topic.

There is also a hydrogen refueling network problem to overcome. Before public electric charging stations existed, electric people could charge at home and install their own chargers where required so the electric industry has been able to partially side step that issue at the beginning.

Finally I think it just doesn't seem sexy. To a casual bystander it's like gas in, pay, then drive as usual.