Annon Jew – most frum Yidden today would not eat from Moshe Rabbeinu’s shchita! I don’t say this merely for the shock factor but the reality is that Chazal over the generations have added and modified many halachos that became not just “chumoros” but part of mainstream halacha, thereby disqualifying the type of “chalev” (knife) that Moshe Rabbenu would have used.
The same applies for matzas – are matzos are very thin compared to matzos in times of Bais Mikdosh that were exceedingly thick. No one today (in the Ashkenazi world) would use such matzos.
I doubt Moshe Rabbeinu wore two pairs of teffilin – Rashi and R’ Tam!
My point is, we cannot simply say that if something was done before the times of Shulchan Oruch, it must be ok. Indeed, in times of Shas, the talmud tells us that in the city of Rav they followed the halacha as cited by Rav, while in the city of Shmuel they followed Shmuel’s view. That does not allow us to pick and choose how we should conduct ourselves!