I appreciate you taking the time for an insightful and detailed response. The link you provided, "Tracking the U.S. government's progress on moving to HTTPS[1]" gave a lot of the details I was looking for.
You might consider mentioning it in this blog post as it does offer interesting background information and technical details.
As a specific example, the actual Python scripts used to generate the data[2] and the data itself[3], give a great deal of insight into the question I had.