There is a difference between calling some weird soft tissue tumor what it is versus creating literature and practice based on your own impression though. Prostate pathology is a good example of the latter. There are all kinds of articles which talk about modifications or applications of the Gleason grading system which often treat it like it is a uniformly applicable tool. But separately there will be articles which gather "consensus" from internationall known experts and the articles find that there is no consensus even on many gold standard cases. I was at a platform session once where an eminent pathologist was presenting his paper on secondary reviews of biopsies originally performed elsewhere, and how there was a tendency to undergrade certain cases. His evidence was that these were "cases that should be interpreted" the way HE interpreted them. Someone asked a question, "How are you sure that the outside pathologist isn't the one that was correct?" And the answer given was not really backed up with solid evidence, more opinion. I thought it was a great question. There have been other studies with Barrett's dysplasia, etc, that show similar results. Literature says all Barrett's dysplasia that are considered high grade should be reviewed by a GI pathologist. But literature shows that GI pathologists have poor agreement amongst each other as to what constitutes high grade dysplasia.
Sending an uncommon tumor to an expert is not the same thing in my book. It is kind of "eminence based" but it's different. There is also no harm in experts using appropriate data and drawing conclusions based on their unique experience. Fletcher's soft tissue experience is based on years of seeing all the oddball tumors and thus being able to distinguish them. Where it becomes a problem is in areas where defined criteria are not clear (like "dysplasia" or what constitutes a follicular variant of papillary thyroid carcinoma). I'm sure there are some that disagree with this distinction though. To me, this is a major reason why many private pathologists have a bit of a low impression of many academic pathologists. We all have experienced having a patient or clinician request a second opinion on a borderline case and having the academician clearly decide it is one or the other based on very little except their personal opinion. When that opinion is backed up by real evidence that is not a problem of course, even if we feel like bad pathologists for not getting it right. But when it's not, then it gets irritating. An example would be a small focus of prostate cancer that we show around the department and agree is best called 3+3=6, but the outside person decides it should be 3+4 and can't really explain why other than "I think there is subtle gland fusion." This bothers the crap out of community pathologists.