On: Up to the 1990s, raw salmon sushi was not eaten in...

[gregoriol]

Maybe knowledge and techniques to make raw meat/fish safe have improved in the last decades?

[kuhewa → gregoriol]

The roots of sushi were in preservation of fish by fermentation.

The major food safety improvements recently were probably for industrialized production, where the issues were often creations of modernity anyway.

OTOH onboard flash freezing equipment for fisheries haven't hurt.