I heard a similar if not identical idea from Rav Schachter. Namely, that why the 12 sifrei Torah, one for each shevet? Because "variety is the spice of life"! And each shevet would have its own Sanhedrin, and might pasken slightly differently. And all of these flavors are beloved to Hashem, and what Hashem wants. And, he continued, nowadays, Hashem wants Sefardim and Ashkenazim, chassidic, yeshivish, etc.
Of course, this has its limitations. As much as we profess to be open to different "flavors" of Orthodox Judaism, I would guess that every religion sets limits on what they not only disagree with, but puts one entirely outside the pale of the religion. For example, as "pluralistic" as we are in condemning that certain blogger for considering only his narrow band to be authentic Judaism, do most Orthodox Jews consider Reform Judaism to be "authentic Judaism"? What do we maintain about Conservative Judaism? Reconstructionist? Frankists? Sabbateans? Karaites? And this is OK, and this is normal, though it makes the distinction between one fellow declaring his narrow version of Judaism to be authentic, and us doing the same.
Even as there were different tribes with different approaches, we see at the end of sefer Yehoshua that it was a big deal when this happened: