Each story I hear about a woman who is wearing such a beautifully natural wig that has stirred up some talk or rumors because she appeared as if she wasn’t covering her hair ( as in the Mishpacha magazine article last week, or as the previous poster mentioned about the woman in prewar Europe) is clearly proving the concern about a natural hair wig possibly being problematic.
Yet, the Chazon Ish didn’t say it was a problem if it looked real, and neither did R’ Moshe.
You are fooling yourself if you think you discovered a new problem which the poskim weren’t aware of.
They were aware, and some of the biggest were meikil, even l’chatchilah.