When I started my apprenticeship as assistant tax adviser in 2016, I used the fax regularly to send stuff to the IRS equivalent. I was also in charge of printing certain thing because the setup for those to come out right was unholy. In the company I am in now, we are pushing for digital solutions but still have a lot of clients with a listed fax number. One of our digital partners had fax: we don’t do that here written in their signature.
It is a thing still sadly.
Currently there are three things that stop me from going Linux and two of those are purely software related (the third is that I don’t want to hate my work software anymore than I currently do). Is it vital software in the sense of it allowing me to work or bring me income? No. Is it something I wish to just use without fiddling after every update because I use them for fun? Absolutely yes.