Here is a list of problems that come with educating women for the purposes of gender equality and female empowerment/social advancement. (These problems do not arise when the purpose of education is to teach religion or become better mothers.)
Problem 1: It decreases the happiness and life satisfaction of women.
Problem 2: It increases the number of unmarried women because educated women generally prefer to marry even more educated, powerful men. But there is a limited supply of such men. So more women are competing for a smaller pool of men, meaning most of those women will not find a match.
Problem 3: It squanders women's youth and energy that they could spend on getting married and having children. It disrupts the normal life pattern ingrained into our biology. When women are at the height of biological need for marriage, they are pursuing degrees. This also fosters more zina.
Problem 4: It harms romance within marriages. Romance for BOTH sexes requires a feeling of vulnerability and dependence from the woman. The damsel in distress is a romantic trope for a reason. But feminism pushes women to be the boss, to be independent, and to undermine the authority of men. Education is the means to all this.
Problem 5: It harms the family. Educated women are meant to pursue careers. A career requires passion, drive, competitiveness, and other masculine traits which undermines feminity, which therefore undermines romance in marriage. But it also detracts from attention and dedication to being a good wife and mother, which weakens the family.
Problem 6: It undermines the husband's authority. Marriage requires hierarchy with the husband as the head of the household. If the wife is more successful because she is advancing on the career ladder or acquiring higher degrees, HER respect for his authority, attraction to him, etc., drops. Feminists want to spin this as the man being insecure, but it is really the woman who becomes insecure and pressures the man to "be more ambitious," until she thinks/feels "Why am I with this loser?"
Problem 7: It increases divorce. This is due to the problems above. If you don't feel attraction and you feel you are married to a loser, you want out. The vast majority of divorces are initiated by women in the modern world.
Problem 8: It leads to more injustice in society. This is because, as more women are educated, the public space is feminized and more and more of society's affairs are put in the hands of educated female authorities. The moral psychology of women is not suited for these kinds of roles. Islam accounts for this with requirements like the testimony of two women being required, prohibiting female judges, Banning female political leadership, separating the sexes, requiring women to have permission to leave the home, requiring mahrams for women to travel long distances, etc.
Problem 9: It leads to the failure of society and civilization. This is because educating women creates female leaders. As the Messenger of Allah sallaAllahu alayhi wasallam has said, no people will succeed who appoint a woman as their leader.