"All in" is a very strange way to describe a multinational corporation producing in the single digit thousands of an item. They tried something, it hasn't panned out yet, they're sticking to what they know works in the mean time.
Because the Japanese government bet big on hydrogen and heavily subsidized the industry. Also, is there any evidence that hydrogen vehicles have short lifespan or require expensive maintenance? I don't disagree about how undesirable they are based on fuel cost but its hard to suss out how much of that is just based on extremely low production.