Question

As is well known, there is a dispute among the medieval authorities (Nachmanides and Rav Hai Gaon) whether, in a disagreement, we follow the number of judges or the quality of the arguments. There is also such a dispute among the halakhic decisors. Some even wrote that this is the dispute between the School of Shammai and the School of Hillel.
The Heavenly Voice decided in favor of the School of Hillel. From this it would seem that the majority does not uncover the truth, but is only a procedural rule. And you have already written about this in the past, rejecting that, etc.
Now I thought that in light of what you wrote elsewhere—that the purpose of Jewish law is twofold: (a) uncovering the truth, and (b) an autonomous value—perhaps the Heavenly Voice decided that autonomy is preferable to truth. And therefore, since most people thought like the School of Hillel (they were the majority), the Jewish law was established in accordance with them. So what is really being said here is that autonomy is preferable to truth.