Since certain “halachos” contradict everything the larger sugya teaches, one needs cognitive dissonance.
Everything about Kinyanim screams “Gemirus Da’as”. So, if you “understand” how Mechiras Chametz isn’t “Devarim shebilibo uvelev kol adam”, you understand nothing about Choshen Mishpat.
Tznius is about modesty. So, if you “understand” how women’s wigs are fine, you understand nothing about any related halachos whatsoever.
The same goes for Eruv, Agunos, giving away Eretz Yisrael, etc. etc.
(See a somewhat similar point made here.)