The whole debate over one space vs. two is just stupid. TeX got it right 40 years ago, recognising that it's no longer necessary to constrain ourselves to a integral number of space characters (a holdover from the typewriter era), but instead to use what it calls "glue" as separators between characters, words, and sentences.
Glue between words is given a higher weighting than that between characters. Glue between sentences is given a higher weighting than between words. So you end up with sentences being separated from each other by more whitespace than words. The exact amount will vary, as the Knuth-Plass line breaking algorithm [1] tries to find the most aesthetically pleasing set of places to break lines.
Arguing for one space or two spaces misses the point.
Glue between words is given a higher weighting than that between characters. Glue between sentences is given a higher weighting than between words. So you end up with sentences being separated from each other by more whitespace than words. The exact amount will vary, as the Knuth-Plass line breaking algorithm [1] tries to find the most aesthetically pleasing set of places to break lines.
Arguing for one space or two spaces misses the point.
[1] http://www.eprg.org/G53DOC/pdfs/knuth-plass-breaking.pdf