Yup. And I do truly believe that modern society plays a profound role in making various conditions into something that is disabling because modern society is very unnatural for us, very counter to our nature, and far as our well being as a whole person goes we aren't as well off as we used to be. We don't have our support, we don't have the others we've relied on for so very long, and we're seeing very unfortunate things from it ranging from parents missing out on their children growing up to children most in need of support and a mentor going without and children not getting as much exposure to various views and people because we try to believe it doesn't take a village to raise a child because it's just too much for two people.
I haven't looked into it, but I would wager post-partum depression wasn't as much of an issue in times past when there more grandparents, cousins, aunt, uncles and trusted neighbors around to help out. Not everywhere or as a whole, no, but how can it possibly be as difficult when you are surrounded by familiar and supportive faces compared to a highly stressed spouse, parents on the other side of the country, maybe a couple good friends and a therapist?
The issue is still present, but I don't see why it shouldn't be that having more support and more help close by is much better for such things than what we have today.