“The hair is suppose to be covered and the shaitlach today defeat the purpose, they are always much prettier than one’s natural hair.”
The halacha is that the hair is supposed to be covered. Nowhere that I have learned does it say that the covering has to be ugly. Your comment pre-supposes that the REASON for covering the hair is to cover up beauty (hence you extrapolate from this that to wear a pretty shaitel defeats the purpose of covering the hair). That would also tend to eliminate pretty hats, pretty scarves/tichels, and anything other than the type of shaitel my Bubby O”H wore in the old days.
The reason for covering the hair is that once the woman is an eishes ish, only her husband is permitted to see her erva and the hair has changed its status to erva as with other parts of her body that are erva, upon marriage. NOT because it is beautiful, not for any other reason than the change of its status to erva. You may as well tell women they cannot wear pretty clothing, also. And you would be out of line to do so.