There are some things where fax still makes sense

Nope.

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.