A word that starts with X in those languages will have the “sh” sound, so “Xit” will sound exactly like you’d expect to hear “shit”, without having to worry about whether the letters are representing the sound decently. I mean, pinyin fucking sucks, who the fuck thought that a good stand in for “j” or “dj” sound would be “zh”? Or that C alone is a good representation of “tz” sound??