The wigs worn in the times of the Shiltei Giborim, the Rema and all the other poskim quoted looked NOTHING liked the wigs of today. They allowed an item that is completely different from today’s wigs. Wigs than looked liked head coverings- they didn’t have the technology of today. .
The heter was a huge debate among poskim- and many great Gedolim did assur the wigs.
But that’s not the point. The point is that today’s wigs are completely hypocritical and immodest. There’s a reason why the wig and extension business is a multi billion dollar industry- the wigs are so beautifying, usually much more so than ones own hair. Wigs in the times of the Gemara were not beautifying like today’s sheitels – which are very provocative. You could quote as many sources as you want justifying these wigs- the truth is plain to see in the streets. Many frum women look unmarried and extremely attracting with natural looking and pretty wigs. It’s a total mockery of the mitzvah
Bh there are currently a lot women that are recognizing this hypocrisy and are starting to wear tichels which are the ideal head covering – both halachically and hashkafically.