[GolangProject]

There are clear cases where "true authorities", however defined, have been wrong about all kinds of subjects, so the fallacy still applies. If you can only justify a belief by appealing to the assumed superior knowledge of experts and specialists, you cannot justify that belief as strongly as someone who can argue from first principles or a clear chain of evidence. The appeal to authority is not necessarily fallacious, but it's more likely to be so.

[thfuran]

If you can only justify a belief by appealing to the assumed superior knowledge of experts and specialists because you lack such expertise yourself, you're probably going to be wrong a lot less often when you appeal to authority than when you decide to disagree with them simply because experts are fallible.

[GolangProject]

That may well be true, depending on the quality of experts and specialists in your society (and assuming they aren't generally serving vested interests that could skew their views), but, epistemologically, you can't prove it without further appeals to authority. So it's experts all the way down!