I asked a rov this question about sheitels and he said even though a majority of poskim don’t permit it, the rabbonim allow it because of the confluence of a) people were insisting on wearing shaitlach and ?? ??? ?? ?? ????? b) there were Sholom Bayis issues when insisting on a tichel and c) at least the women were covering their hair altogether, something that not long ago was a very difficult thing to accomplish even with shaitlach. Because of this it became the communal norm in most places to permit them since we need to choose our battles.
