barely? I haven't used a fax machine in Japan in > 10yrs. 20yrs ago it was indispensable. For example you wanted to go somewhere you'd have the store/museum/etc fax you a map.

But, yes, Japan is behind the times many ways. It's apparently on the government agenda to modernize. Social distancing has made it clear that requiring personal stamps to stamp papers has to be replaced by something else.