Two spaces always put me off typographically in monospace. The sentence-ending dot plus a single space already create a much larger gap visually in monospace than in proportional fonts, and with an additional space it just becomes ridiculous. It would be fine in proportional font I guess.
>As an oldster, I have to force myself to not use two spaces, so I don't reveal my oldness to the youngsters. Once space still looks weird to me.
People make weird claims that two spaces was from typewriter days to keep them from jamming or something, but honestly two spaces is so much more readable and it's annoying that web things and work processors try to remove them.
