“So you think it’s utterly impossible and incomprehensible that anything that Chazal or a latter rav says could possibly be influenced by their place/time/culture? You think that everything they said was said in a vacuum and eternally true regardless of changing social norms across the centuries/continents/cultures?”
Everything Chazal say is Torah. And Torah is ALWAYS TRUE no matter where you are are when you live. When the Torah says something its true. Teh Torah says that noone nows where Moshe is buried TO THIS DAY and its true TO THIS DAY. It was true, is true and will always be true – just like everything else Chazal ever said, because its Torah.