[Avodah] Conflicting Sources

[Cantor Wolberg]

"Tefillin, for example, was left a machloqes for millenia. Yigal Yadin
found evidence of the machloqes back in the days of a Sanhedrin, and it
lasted into the 12th century (Rabbeinu Tam was born in 1100 CE).

Tzitzis in the days of the Sanhedrin were tied in a wide variety of  
ways.
The geonim, rishonim and achronim come to many different recommendations
given the conflicting sources."

I thought the purpose of the Torah She-b'al peh was to illuminate the  
protocol for many things such as T'fillin and Tzitzis.
Therefore, why would there have been conflicting sources when the main  
source is from God?

ri
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