But he also gives the reasons why current authorities say one, and previous authorities say two - all due to the aesthetics and readability of spaces with propo

But he also gives the reasons why current authorities say one, and previous authorities say two - all due to the aesthetics and readability of spaces with proportional typesetting versus monospaced type. The reasons are fairly subjective, but I don't see why so many here are dismissing them simply as pure arguments from authority.