I’ve just come across this draft https://tools.ietf.org/html/draft-ietf-ntp-bcp and I think this would help introduce a more authoritative source on NTP server best practices (stackoverflow is not a good place to get best practices). I recommend we add it in somewhere on that page.
One section I was interested in was the Leap second bit where it is crystal clear that leap smearing is bad for public servers and explains why. I also learned about mean solar time and power
Another thing I like that it was written for NTP server operators in mind.