I wrote the original version of my manuscript formatting guide in 1993, modeling it after a much older two-page guide I received from Damon Knight in 1985. Back in those days, even for those who'd made the switch to composing prose on computers, the goal of formatting was to produce a document for submission that looked as much as possible like it had sprung to life rolling through the platen of a typewriter, offspring of holy intercourse between paper, typebar, and ink ribbon.
The world of writing and publishing has changed plenty in these past seventeen, or twenty-five, or God knows how many years. A manuscript used to be the mere blueprint for a printed book or story, instructions in a coded language to the typesetter who would laboriously rework the entire thing into clean, finished type. Now the gap between manuscript and book has shrunk to the size of a computer file. Electronic submissions mean that the only physical keystroke in the life history of a given letter in a published work may well be the one executed by the author himself.
The accepted and acceptable standards of manuscript formatting have evolved to reflect this. Proportional fonts are used more and more in manuscripts, while typographical tricks that were necessary on typewriters now no longer make sense. More and more writers are submitting manuscripts that would have looked unacceptable a decade ago, and more and more editors don't mind this one bit. With the almost complete dominance of the word processor, topics like word-count approximation and end-of-line hyphenation are no longer relevant to most of us. It was long past time to update my format guide to reflect this new reality.
You old-school writers and editors, don't worry. I won't abandon my Courier font and double sentence spacing (more on that topic in a future post) without a fight. If I have my way, the manuscripts I produce fifty years from now will look the same as the ones I produce today. But I did want to acknowledge that mores are changing, and that not everyone agrees anymore about what proper manuscript format even means.