I'm old, I've been about biology for a long time, it's never been that way.
* https://en.wikipedia.org/wiki/Phases_of_ice is a cracking read. Good science.
We observe one predominent form of solid water most often in our environment - but other forms exist and frequency varies elsewhere.
There are literal tomes on disorders of sex development, it's a subject with decades of solid research history and centuris of literary reference.
"Strongly bimodal with some outliers" has been an ideal summary for a complex domain until ... recently.
What motivates you to shoehorn every birth into one of two boxes despite the theorectical and practical issues?
