I write in a gender independent style (unlike your comment!).
That is why I didn't bring up a "my wife" or "your wife." Many of the folks who responded to the email were women running startups who have stay at home dads, or dads as primary caregivers.
Additionally, there are families with one parent, three parents, four parents and any number of gender permutations. (Think divorced folks who remarry/re-partner... thus the child having 3 or 4 parents).
I tried to address the issue of a startup founder and a baby, and figured it was implied that your partner (or partners) need to buy in.
You are correct in that you need your partner(s) buy in, but incorrect in that the person has to be a wife!
Finally, it's wildly offensive to say women should not run a startup. I'm guessing you are troll in order to get a reaction here, since you're making such an outlandish statement AND saying you won't discuss said outlandish statement (in a discussion forum).