Kind of ironic how an article that praises plaintext shows up as absolute garbage on my iPhone with or without reader mode.
> End your lines at between 60 and 75 characters, or so. (There's a reason[3] that newspapers and magazines do not use the whole width of their page and instead create much shorter columns.)
The author forgot that the reason is that newspapers and magazines control the medium on which their text will be read, and know how wide the reader's page is.
There's nothing more annoying in the programmer's world than the assumption that the reader will prefer to read prose in monospaced font, in an area that's 80 characters wide.