The author's amazement at the oblique reference to teletype outputs is hilarious. Kids these days forget that much of Unix (and most other things) were created without the benefit of "glass teletypes" (aka screens).
As always, "kids" == younger than me. But no, I've never used a teleprinter for anything serious.
Still, the evidence of their recent departure is all around us. vi (short for "visual", because the idea of a visual editor was still pretty novel) didn't even exist until 1976.
IIRC, "backspace" as an overstrike compose character continued to be supported for quite a while after the death of teleprinters. Some BBSes depended on it, for example.
