Some RPGs are demanding. While you can’t homebrew D&D into anything, it is still flexible and doesn’t demand that you play it a specific way. Some games do. There is no end of teeth-gnashing about this; for some reason people take more issue with RPGs having set procedures than, say, board games. But, as the entire indie RPG community knows very well, making a game for a specific purpose and experience often nets you a better version of that experience than trying to simulate it with a ruleset designed with breadth in mind. I’ve been having some revelatory experiences with such a targeted game recently; I will say though that when I say “targeted game” and “specific experience”, most are imagining a zine, something small, not a 600 page hardback with red and gold filigree. Yeah, I’m talking about Burning Wheel.