The whole damn point of "use one space after periods" was "...because we're using proportional fonts now"
They couldn't have said that line at the top? Or would no one read it then?
ProTip: Don't read this article.
I was so annoyed at being tricked I'm posting this to warn off the next reader, and I flagged the story to really get rid of it.
Using two spaces after a period makes sense if you are using a typewriter. It's nonsense if you don't even own a typewriter.
The only argument I've ever seen for one space is that two spaces are supposedly ugly because they can cause rivers of white space to run down the page. IMO readability is more important.
Abbreviations have always been my sticking point.
eg: A list of this, that, etc. conflicts with the end of sentence.
Two spaces here is unambiguous. When I typed this on mobile, the parser did not understand "etc." was not end of sentence when it could have by looking for two spaces. Because of that, it shifted incorrectly into caps mode, producing "Was" instead of "was" as would be indicated for a word mid-sentence.
The result is a lot more input being required to complete the sentence properly.