No, it's because Japan is a deeply conservative country, really adverse to change, because change means taking risks. If you ever had to deal with Japanese you would know, layers upon layers of convoluted procedures for no real reason.

But hey, at least now I can get the "my number card" to get my hanko certificate from the convenience store. Maybe in 30 years I will be able to use the card directly to prove my ID without needing the stupid hanko!