I find it much easier to find the function definitions when the word function is a different color than most of the surrounding text.
if the author meant "find a specific function def according to it's name or role" then I could at least appreciate the perspective. As it stands, I can't help but notice that their supposed "better highlighting for finding defs" example is not using the same source code: the preceding anonymous immediately-invoked function that englobes the entire first code block/sample is now off-screen and the code blurb itself is different...