You don't want people judging this excellent book based on few language quirks here and there.
I used Lyx because it enabled me to focus on the content without all the markup text. Writing Latex in Emacs can reduce the distraction, but not enough. I just wanted to focus on the content at the time. Learning Latex is difficult enough, learning how to use the major mode at the same time doubles the difficulty.
Obviously, I still use Emacs daily for writing code and other things. Just not for writing book.
https://en.wikipedia.org/wiki/Muphry's_law
If this was intentional - well played. If not - thanks for the unintentional demonstration of Muphry's Law :)
[ten seconds later] Now scanning my own post really carefully for misspellings and grammar errors ;)