hawkeyefan
Legend
You might want to be a bit more specific with this; as what you specifically mean by "contribute to the shared fiction" and what anyone else might mean by it can (and does) vary widely.
For my part, as a player I feel I've "contributed to the shared fiction" the moment my character opens its mouth and says something; or even the moment I describe my character's looks and appearance when it's first introduced to the other PCs. And as this is true in absolutely any RPG out there, it thus follows that I-as-player can contribute to the shared fiction regardless of system in use.
What you mean by the phrase, as I know from experience, is something quite different; and while you'll probably dismiss my above-noted contributions as meaningless by your standards, rest assured they are not by mine.
How about if a player contributes to the shared fiction in another way? Let’s say they have an idea for a goal for their PC and maybe it involves a church of some obscure god and an artifact stolen from the PC’s family.
So the player has added an organization to the fiction and possibly a deity and an artifact and some conflict between that organization and the PC’s family. This is also material that can be explored through play; the GM can pick up these threads and weave them into the unfolding fiction.
Now I know you might start twitching at the mere thought of this, but rest assured plenty of games allow this.
So, knowing that such a game would also allow a PC to open its mouth and speak and for the player to describe the PC and give them personality....knowing that it also allows this most basic form of contribution that you choose to celebrate....would you say that this game allows more contribution to the fiction from the player?
If not, why not?