China has now far surpassed it as cyberpunk society of the future, but Japan is basically stuck at what we thought the year 2020 was going to be like in 1980
But then, most of the times people use that phrase something is obviously broken.
One reason I heard is that in Tokyo at least, the usual way to communicate a location is to draw a map, often with directions from the nearest subway station. Postal addresses are hard to work with as most streets are unnamed, and usually, only local postmen and policemen can comfortably navigate with them. These maps were often sent by fax. Maybe kanji has to do with it too.
Also, it is common for people who have good access to at a time modern technology to take more time to get to the next advance, may even skip it entirely. For example Japan was along the last in the technologically advanced world to get to smartphones, because they already had really advanced featurephones while we were stuck with Nokia 3310s. So while for us, the first smartphones brought us a lot, for them, it was in many ways a downgrade.
So, for us, email was a replacement for slow and expensive mail, for them, it was a replacement for already pretty fast and effective fax machines. There is less of an incentive to change.
Another example of a silly and easily fixable problem that will likely also go unresolved for years for the same cultural reasons.