These grammarians climbed over one another, defining increasingly complex guidelines to distinguish themselves from their predecessors and inevitably punctuation fell victim.
Prescriptive grammarians took hold and told school children that just as there're fundamental laws of the universe, there is a definitively correct way to write English.
Now, there's an argument between grammarians, people who study grammar, who think that " each other" should only involve two characters, " one another" should involve more than two characters.