Women entering the labor market is more effect than cause.

Yes and no. Technological advances that made “work” less arduous and less dangerous invited women to join the workforce to make some extra money. But the resulting effect on families was unstable. Competitive forces require that either very few women work, or almost all women work (and wages fall accordingly). Thus, what starts as an effect becomes a cause.

Specialization is not necessarily the same thing as gender roles.

“Not necessarily” is almost always an evasion of statistical reality. Gender roles are a strategy that enables a certain kind of specialization by allowing “specialists” to learn their specialties before they have to apply them. No one has come up with a better way for future specialists in such broad specialties as “breadwinning” and “homemaking” to decide which of those skills to acquire and how to acquire them.

Gender roles work for most people. Those for whom they do not work are outliers. Those people are real, and their needs must be respected, but they are not the center of social gravity, and the needs of those who are that center must be respected, too.