“It’s hard to learn how to spell. It takes practice, patience and a lot of dedication.”
^ In a proportional font the difference in width between ‘ll’ and ‘ ‘ is noticeable. In a monotypes font, two spaces after a period provide a visual cue that that space is different.
I think this is why this all lowercase style of writing pisses me off so much. Readability used to be important enough to create controversy - nobody cares anymore. But, I didn’t care enough to read the whole article so maybe I missed something.