This is more about having the existential courage to overcome one's ontological anxiety of letting go of the two spaces and adapting to the modernized one space.
I use an application called Scrivener for most of my writing these days, especially writing that may wind up in downloadable bookish format. Fortunately, Scrivener automatically strips double spaces after end-of-sentence periods when you export the file.It also automatically converts "..." to "..." and multiple dashes into either endashes or emdashes depending on quantity (which Word also does most of the time).I kinda wonder what other typographical abominations Scrivener automatically fixes.
Took a brief typing class in high school, last couple of weeks after my folks and I got back from a 7 month trip to Europe (Dad was an English teacher - pioneer in ESL back in the 60's). One space, reinforced by Dad, he could do 150 WPM on a bad day, but that was on a Selectric. In his classes, he didn't really care, though he advocated one space. He was more interested in the content.