Earlier quoted context omitted.
That's rebutted by the Janet Malcolm quote the author includes. The absences of knowledge isn't impartiality: people don't render decisions from ignorance + logic. They simply fabricate their best attempt at knowledge and apply that to the situation. So in this respect, it's not a choice between "relying on legal experts to provide legal information" and "using your own amateur legal knowledge" but rather "bastardizi…
I think the intent is to have people "relying on legal experts to provide legal information". What often happens is "bastardizing legal experts' explanations to fit your own views". I suspect there's a fear that trying to apply the law on one's own leads to the latter happening more. But one could argue that it happens anyways, as you point out. I wouldn't argue the absence of bias, we seem to be in agreement there,…
In practice, the judge is supposed to serve this role, no? But I think it's readily apparent from the variances in judge activism that judges are people too. In hearing all the details about the case they can't help but form an opinion and are in a position to act on that opinion to varying degrees should they so choose.