> Most modern boardgames do something like that (although typically in a single book with multiple sections).

As a member of a boardgame club having played to approximately a hundred of less-than-two-years-old games[1] over the past year and a half, I can assure you most boardgames don't, even modern ones.

[1] yes, there are that many games. A few years back there were approximately six hundreds new games being released in a year, for the French market alone (granted it's one of the most dynamic), and I heard it more than doubled after Covid so I don't know where we're at right now.