Well, obviously, if you aren't specifically looking for something and systematically documenting it, you aren't going to know the whole story. If people don't view women's incontinence, pelvic floor disorders, and sexual dysfunction as problems of significance (and historically they haven't) then any analysis they offer is not going to give the full picture.
There are studies saying that it's all a wash, but they're not that convincing. If you look at the urogynecology literature you'll find information on specific problems, many of which are unique to or especially common after vaginal birth.
And speaking for relatively young women who have had these problems directly after childbirth, it's no consolation to read "we'll all be in the same boat at 50" when you're only in your 20s or 30s and you're dealing with these problems now. It's frustrating to hear claims like these when you know that your injuries (and many other women's) were directly caused by vaginal birth, but your own suffering and loss and subsequent surgeries are ignored by people who don't seem to want women to know the truth about what can happen.
I'm not suggesting that all women have CS to avoid pfd, but I think they should be given real information about possible risks of both CS and VB and allowed to make an informed choice.