Hold onto to that cheddar Dave. I have shared how I would love rip the diesel engine out of the 60 and replace it with a hydrogen engine (once it becomes available at the pumps). Toyota keeps pushing concepts like this, Akio Toyoda might actually get to see this dream of hydrogen cars though.
Yeah the whole Mirai has been a complete turd from the start. From fuel availability that California said was coming to the infrastructure that never happened (lawsuits filed against Cali and Toyota for that). The car was super rushed in design because Toyota saw a great opportunity to market, what at the time was their future as a company. Because now carmakers seem to feel that product testing should be done by consumers vs doing it before sale. Thats why the rule of thumb now is "Dont buy the first year of a new Gen". But as an engineer, you can understand that you fail a thousand times before getting it right once. The Mirai is one those perfect examples of an ambitious automakers that failed with issues..... Yugo.
The first problem with both EVs and hydrogen is the involvement of government. As long as automakers continue to rely on tax money to get the infrastructure in place, it'll remain an issue, because everything the government touches turns to muck.