Yes there are general challenges in research, but not sure how that really changes the argument that there's significant amounts of research in this area and novel peer-reviewed findings.
No, I am implying that 14k articles were produced on the topic of Long COVID clearly differentiating it from "fibromyalgia". Which is a viewpoint only shared by a select few not even researching the condition.
https://academic.oup.com/nar/article/51/D1/D1512/6814452
Yes there are general challenges in research, but not sure how that really changes the argument that there's significant amounts of research in this area and novel peer-reviewed findings.