Were the sheitels of 150+ (or 100) years ago natural human hair or were they something else like synthetic or fake hair?
If the majority of sheitel wearers 150+ or 100 / 75 years ago didn’t wear natural human hair sheitels, it could be the quoted poskim from those times were speaking of a different product/question in their psak than the issue with the majority of wig products in the Jewish market today.
Somewhere earlier in the thread someone claimed that it is only in recent times that most women wear just wigs whereas in previous generations most women had the custom to wear something else, either in addition to a wig or instead of a wig. When/why did the custom for most Jewish women change to wear only a wig?
I seem to recall it might have been the Czarist Russian government that legislated in the 19th century against Jewish women wearing a visible head covering, and the police beating women caught with their hair noticably covered, that prompted many women to change to using wigs instead of snoods.