'How a society treats women is often a very good indicator of its level of sophistication'.If yes then why?

Today Equality and Liberty are the basic rights granted to women, women now are considered equal to men in almost every way it represents that we live in a well-developed and open minded society. In contract the traditional practices in society like child marriage, or women having no access to education. Indicates that the society was sophisticated and there was lack of progress in society. Hence proving how a society treats a woman is often a very good indicator of its level of sophistication.