I have played and run games where the players had a lot of ability to write things into the game world. I came to find them ... well, I think because the worlds were so mutable I came to find the stories lacking.
My current approach is to give players a lot of ability (subject to negotiation and/or veto) to write things into the world as their characters' backstories (what happens before they join the campaign), but ... remarkably limited ability to do so once the campaign starts. That said, once the campaign starts the characters are welcome to change the world as much as they want, within the limits of their capabilities.
My current approach is to give players a lot of ability (subject to negotiation and/or veto) to write things into the world as their characters' backstories (what happens before they join the campaign), but ... remarkably limited ability to do so once the campaign starts. That said, once the campaign starts the characters are welcome to change the world as much as they want, within the limits of their capabilities.