jothar- if you don’t understand that teshuvos do depend on when they are written, then you have no understanding of halacha.The gemoro sets down principles and so does the shulchan aruch. Teshuvos interpret thses principles and rule according to the requirements of the time. After WW2 there were thousands and thousands of agunos and the Rabbonim (chareidi all) used every kulloh in the book to allow them to remarry. in different circumstances, clearly, they would not have ruled similarly. THAT is why the date of a teshuvo is important.
Even R’Moshe himself accepts this. see his teshuvos on whether the shulchan has to be in the middle of the bais hamedrash and his comments on the chassm sofer’s psak on this.
The latter comments including what you quote rom R’Moshe’s teshuvo,have no place in the realm of halacha. It is a ‘feeling’ and things sure look different from which angle you look at it. R’moshe zz’l ,himself, did not heed these SAME kind of arguments when he paskened that artifical insemination is allowed.