Nonsense, this isn't new. CNG vehicles have been driven on our roads for decades. Honda has sold a CNG Civic in the US since 1996. The actually have a higher safety history than gasoline vehicles.
But if you could, I would see this as propane installer told me that you will never see a propane gas furnace in the basement of a home because of the safety equipment required. Therefore if you could do this you will need a approved spark proof ventilation system, a redundant fire and gas detector alarm setup, a set of spark proof tools and an approved fire suppression equipment .
You made a good comparison. None of that equipment is needed for either system. Just because it is new to you doesn't make in unproven and unsafe technology.
Also It wouldnt be surprising that you might need a much larger gas line to the house and a commercial gas meter.
No, the home fill units are slow fill. The flow rate is not significant compared to your furnace and stove.
Lastly few people would want to deal with the trouble of filling the car a couple of times a week because of the danger of not only fire but of cryogenic burns and the danger of asphyxiation.
You are still imagining dangers that do not reasonably exist.