This is precisely the main point.

The majority of complaints submitted to the Arbitration Committee (AK) come from newcomers. Because when experienced users start arguing with each other, it happens publicly, loudly, and with the participation of most of the active forum members. The judge only needs to avoid interfering with this "party" and then simply record the will of the people.

However, dealing with newcomers almost always falls to the AK because their complaints rarely gain enough resonance for broad discussion.

In my opinion, it's the opposite. If there's a conflict with newcomers, the experienced users and the entire forum will explain the "party line" to them. But when there's a conflict with experienced users, such as cheating on a computer, as recorded in a video, that's when the AK is needed.

And for the future, I would suggest that voting in the AK be done without publishing who voted for what. To avoid personal attacks.
You choose members for the AK, which means you trust them. They make a decision, which means you trust them. :)