The problem is not just in the tech industries. Many women feel that a “woman’s success” is having a family and raising children. Success is not necessarily j.o.b. related in a woman’s mind.
Speaking for myself: I have no children, but being successful for me is ensuring all the members of my family (and a few good friends) are happy, safe, and cared for is success. It would be a bonus if my web development career or art career goals took off, but they are not the key to my happiness or success.
The other issue I can see is that these women in tech conferences are presented differently. Much of the content is to “empower women” or make them feel like they made the right choice. Most women in tech are not going to want to be treated that much different that men. The conference should present the same information that a all gender conference would, but have the presenters women.
Women in tech fields do not really need to be empowered. We know we are awesome. We want information that will keep us awesome.