I don't think we need fax anymore either, but.... Many companies have a strict policy about not asking for private information via email which includes PDF attachments. That only leaves three methods for getting documents.
Outdated fax.
Slow snail mail.
Direct server uploads. <<< Many companies don't support this.
That leaves me sending one or two faxes per year. Google doesn't "officially support" faxing. I've heard other people say they have used it to varying degrees of success. I haven't tried myself. This might be a good time to pick up a fax machine from a garage sale lol.