All those “sensitive” issues are plain ideological ideas and some people want those ideas to prevail by suppressing all conversation around them.
In general, in the West any study of relationships between the aspect of the body (any inherent traits) and the mind/psyche is forbidden. A few years ago the Chinese published their famous study of facial traits of convinced criminals. [1] The result was that there were more variations from the mean among the convicts than the rest of the population. Of course everybody criticized the study as unethical and minority-reportesque.
The only danger I see is that by effectively renouncing to analyze any links between the body and mind we might lose some important insights, and the vulnerable groups could also greatly benefit from discovering these. But the danger that the result of this kind of research will be used against us is not negligible, as the history shows.
[0] https://www.cnbc.com/2019/04/08/the-science-behind-why-so-ma...
What is controversial is using cherry-picked scientific results to tell just-so stories about why the gender distribution in certain fields is imbalanced.
The study on the facial features of criminals was criticized mainly for its shoddy methodology, not for being unethical (see e.g. https://www.callingbullshit.org/case_studies/case_study_crim...). Of course, people did point out that the research could have unethical applications – which strikes me as an obvious and fairly undeniable point. Your assertion that research of this nature is "forbidden" in the West is trivially refuted by googling: e.g. https://core.ac.uk/download/pdf/288373839.pdf https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3366989/
The only rules were to not take offense at a difference of opinions and not devolve into ad hominems and personal attacks.