Old boardgame (wargame) rulebooks used to have numbered sections and subsections. I often miss that in modern rulebooks, even if some wargame rulebooks still have them luckily. It is so much easier to discuss the rules of a game when you have unambiguous identifiers for every paragraph rather than having to come up with ad-hoc vague references to some page and location below a heading.

The linked article has numbered sections, which is nice, allowing for specific references like "in Section 2.3" or "Figure 14.4", but the example rulebooks discussed from what I can tell do not.