Donald Knuth has his secretary print his email. He'll handwrite replies on the paper, and she'll send them out.

You should read some of the Emacs mailing lists. There’s been a recent (~last 12 months) discussion about changing the default Emacs logo. The proposed new logo, an SVG, was attached to the mail parent. A side thread ensued when RMS asked how to open an SVG and view it in its image form.

I love my Emacs. And yet here I am completely dumbfounded by this interaction!