reading and rereading and listening to podcasts that I've been meaning to get to for years - Here's something from Against Proceduralism (Miguel Sicart, 2011)
Game designers are supposed to create play, that is, a particular behavior in players. Proceduralists believe that those behaviors can be predicted, even contained, by the rules, and therefore the meaning of the game, and of play, evolves from the way the game has been created and not how it is played; not to mention when and where it is played, and by whom.
The proceduralists are predominantly talking about video games, but I think I see this attitude a lot wrt to TTRPG design as well. This attitude towards game design is one I'd like to avoid.