While you can’t plan for all specific eventualities, it certainly makes sense to have these conversations with your partner if you plan to have children. What are your expectations? How are each of you going to achieve the balance you want in your life? Dh and I both left university with the same level of education, we were both equally capable in our jobs, we both wanted children, and we’ve always both been equally able to do the domestic load too. Many of our friends are similar- unsurprisingly, people tend to partner up with someone who has a similar outlook on life, similar level of ability etc
Reading this thread, it seems many many people wish for a better balance, and regret the fact that having children has blighted one career while leaving the other unscathed. I suspect that many women start out wanting a good work life balance, but social conditioning gets in the way. There are so many references to husbands being applauded for doing basic parenting, and women getting looks of disapproval for daring to miss a school assembly.
Depressing reading- particularly as it’s predominantly women who are judging other women. There are some real double standards too.... the posts which say ‘oh but when I had children, I re evaluated my life and realised how hollow my success at work was and just gave it up’ .... always make me think okaaaay, so you’re happy for your husband to carry on his hollow existence in the workplace 
Seems it’s different because he’s a bloke
We tried hard to have a good work life balance and ensure that our children were raised seeing us as both having careers as well as being hands on parents. It was harder back then too because there was no paternity leave, no rights to parental leave and very limited flexible working, but we did our best and i do feel that my career, although affected particularly in terms of pension, has been no where near as impacted as it would be if I’d stopped working for a year or more, or never returned to full time work. I really hope if my own children decide to have kids, they find it easier to achieve a healthy balance of parenting and career