Like people leave their engines idling while waiting for a pump and that’s not an issue… and if there was a chance of a spark traveling back along the line and ignigting the tank (and thus, the station), then why doesn’t this happen during normal operation?
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I think it’s more of a theoretic risk but easy to accommodate w/no downsides. The risk is that a spark could ignite gas vapor. Vapor would be near the nozzle/fuel cap and shouldn’t be in quantities that would easily ignite except in situations where something is malfunctioning. Due to the incredibly large numbers of times people fuel their cars, though, if turning off the car has even a tiny tiny positive effect it has been deemed the safe and recommended practice for everyone.
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