There are some things where fax still makes sense. Maybe I'm old, but I'm not a fan of "digital signatures" and "digital seals" for professional licenses. In cases where a document needs to be signed and/or sealed, I would much prefer a fax to a PDF with a "digital seal". But that's just me and I'm a weird dude.
Edit: Turns out fax is insecure. Did not know this but it makes sense.
Fax is insecure, you'd be better off signing w/o a "digital seal" or whatever and emailing it in. You can also print, sign, scan, and send, just like w/ a fax, but send as a PDF instead of insecurely over the telephone wires. I've done both digital signatures and scanned regular signatures, both work and are better than fax.
I actually find this interesting, part of me wonders if there technological advancement meant they didn't need to make changes/innovation, which led to others having issues having to innovate beyond what Japan did.