Two spaces after a period was back in the days of typewriters and monospaced fonts.

True typesetting, as any typographer will tell you, is one space after a period.

These days, everything we type is like typesetting because modern computers, printers, web sites, etc., all have true typesetting capabilities.

Smart quotes still seem to elude a lot of systems, and don't translate well across all systems, but other than that, we're all typesetters these days.