Your "off the top of my head" would be the main ones I would have come up with, maybe not quite as fast as you did. :) WP is very much of its time in terms of PHP good (and bad) practice.

(Also, WP's style guidance is super weird compared to, well, just about any other PHP style that I've ever seen anywhere, or that of any other C-style language, for that matter. I know that's subjective, but it's Just. So. Weird.)