Why are some manufacturers, like Honda, still pursuing them?
Here’s a good answer, posted by “Pangolin” as a comment on my first reference above: “I suspect that Honda’s strategy was to develop electric car components and systems using hydrogen-vehicle research subsidies and have them on tap for fleet conversion to all-electric or plug-in vehicles. Toss the fuel cell and the hydrogen tanks and install larger batteries and you have an electric sedan. Throw in a small Honda generator and you have a plug-in hybrid. Off the shelf, every bit of it. The nasty bit from Honda’s point of view is that they will sell fewer vehicles. The only thing that could make a Honda more reliable would be to give them electric drive trains. That makes cars more of a long term investment as components would become swap-able. It was best to get all the bits right and wait until they were forced to make the shift.