I think the biggest obstacle to the cooperative experience is the GM wanting to control the game, by deciding what counts as the "real" stakes of the game.
So I think concepts like "the plot", "the adventure", "sidequest" - all terminology which prioritises the GM's vision of the game over the...
Prep does't bother me, I'm looking for a different storytelling experience. Like a sandbox coop style, where the dm is just as part of story as the players are...I'm asking a lot I know :)
Valid question. I'm not sure that the d20 requirement helps, because d20 is perpetually plagued with "does a hit mean I'm injured," "what does 'hidden' mean," and "how do the rules handle this" questions.
Agreed, I guess said D20 because I am the most familer with it. But I'm open to reading...
Something that can brige the gap of player and DM and there working together on the story. Rules are that written without a DM guide. Like if a new person read how to play the game they would also understand how to run one.