Reply To: What did people do before Rashi invented Rashi tefillin?

I might add that there are two additional opinions regarding the order of the parshiot. One of the Ra’avad, and one of the Shimusha D’rava (debate on who he was). Needless to say, not all agree on what exactly the Ra’avad had in mind. If one wants to be a good litvak , one would need two Shel Yads and four Shel Roshes.