If your editor auto reflows the text, that will conflict with this, by erasing line breaks you inserted.
This is imposing an 80-character line length limit. With a line length limit, I want an editor to reflow my text so I don't have to do the line length limit manually.
Many editors allow reformatting a user-selected portion or the current line, and some even the current sentence, with a simple keyboard shortcut.
Reflowing the current line won't work. If I delete a word, I need the next line's text to be flowed up to join with the current line. And that might require reflowing of subsequent lines as well.
Reflowing the current sentence won't work, because this style involves inserting semantic line breaks in certain places within a single sentence.
Reformatting a user selected portion is going to take more effort on my part. Currently my editor reflows the entire file every time the file is saved; I don't have to think about which part to reflow.