I agree with the decision to leave "makes the same career choices" out of the equation, but I think people have to admit a lot of those "choices" aren't free from gender based social pressure. My wife's attitude going into parenthood was that she was going to "parent like a father." This was a necessary consequence of us both maintaining busy careers, but I have to say that I make out a lot better in peoples' eyes for doing the same level of parenting. I take the night feedings? I'm some sort of wizard dad. She prepares the lunch for daycare? Why doesn't she make this or that toddler puree? When a stranger glares for our daughter not wearing socks in the cold (I swear she had them on when we left the house!), its never at me, always her. As a result, she's racking up a non-trivial amount of working mom guilt. She doesn't want to mommy track her career, but it irritates her that if she did people would support her decision in a way they wouldn't if I did the same.
As someone who will be in the same position as your wife not too far from now, this is both good to know and frustrating. Have you ever had people refer to your taking care of the kids as "baby sitting"? I've heard that one is common.
That sort of comment just sets the bar low for what's expected of me. Meanwhile, my wife wants to be perceived as a good parent too, but she can't get too invested in that because she can't reconcile her career with all the baby wearing/toddler puree/breastfeeding until two stuff that's the benchmark in her circle of mommy friends.