That's why we ask for sources. If one doesn't trust lamontcg to know what they're talking about, we shouldn't trust them to be honest about that fact. We're often more likely to have Bayesian priors about a primary source than the people who refer to them.

Yes, but in this case authority would be your prior, and a source would be the data to update that prior. If you are only relying on authority, you are solely going off of your personal biases, which while potentially informative, isn't as useful as actual data.

A perfectly reasonable approach; but then it is easier to ask people you trust rather than reading HN. Anonymous internet people are inherently unreliable.