On the topic of significant misunderstandings would be the above. All the posters that you've been primarily interacting with here have no issues with D&D, sandbox play, or living worlds in general. Nor are any of them advocating for a secret sauce level up for the games they've examined in the course of the discussion (Blades, DW, Traveller etc). The goal has been, and continues to be, to get granular about prep and prep styles in terms of what they actually accomplish at the table. GM notes is probably the most common play style, which is probably a function of the popularity of D&D generally and the accessibility of just running published adventures more generally. There's nothing wrong with that at all, but it's also not what experienced GMs tend to do in their games. It's not what you do, it's not what I do, and it's not what
@pemerton or
@Manbearcat do.