mdd: I will refrain from saying anything “ad hominem”, so thay your sensitivity does not get bruised. let’s get back to halochos and shaalos uteshuvos.
I do not have the erudition of rebdoniel and/or deep research, but you are wrong to assume that his sources are not valid. I’ll give you two examples for people that you surely must respect.
The Nodah Bejehudah ultimately gives a hetter to shave chol hamoed (well known kuloh) and R”moshe zz’l agrees. Don’t you think this is due to adapting to the circumstances?
R”Dovid Hoffman zz’l ,in his teshuvos “melamed leho’il” allows a gentile woman to convert,even though it is because she wants to marry a jew. (he does it a number of times). Isn’t that adapting to circumsatances? (R”dovid says as much).
There are numeous kulos that have been used for agunos, especially during the two world wars. Don’t you think this is adapting to circumstances?
I could do more research and show more sources but you get the idea. Poskim throughout history have used circumstances to pasken. In yeshivos, you can afford to remain aloof and untouched by life circumstances. Not so to Rabbonim and Poskim.