But you have to separate the fallacy from it being supportive evidence of other data.
There is a difference from saying X must be true because Y person said it and they're an expert on Z. But when there is consensus between appropriate experts - such as researchers that specialize in this field - and it is in support of other specific evidence it is supporting evidence that the other specific evidence is compelling.
If I have 10 CPAs explaining a specific bit of the tax code to me and they are pointing out the specifics of the tax code, it is not fallacious to note that these people are experts and are pointing to specific evidence that supports their point.
But you have to separate the fallacy from it being supportive evidence of other data.
There is a difference from saying X must be true because Y person said it and they're an expert on Z. But when there is consensus between appropriate experts - such as researchers that specialize in this field - and it is in support of other specific evidence it is supporting evidence that the other specific evidence is compelling.
If I have 10 CPAs explaining a specific bit of the tax code to me and they are pointing out the specifics of the tax code, it is not fallacious to note that these people are experts and are pointing to specific evidence that supports their point.