Celebrim
Legend
In a closed ruleset, my capacity to impose my will on the world inevitably feels limited by the DMs willingness to let the world be imposed upon.
I don't think the two have anything to do with each other.
First of all, your capacity to impose your will on the world is inevitably and always limited by the DM's willingness to the let the world be imposed upon. Even with an open system, there isn't a DM worth his pizza that can't use the rules to achieve the results he wants 99% of the time if he really wants it. Storyteller is IMO particularly bad in this regard, in that in my experience its a system very open to interpretation by the storyteller - including, because of the intricancies of its dice pool system, even accidental manipulation because no one really knows the odds of anything.
Secondly, Storyteller is by no means an open system. You can run Storyteller as a closed system. You could even run it as a completely closed system (that is, the players don't even know what the rules system being used is). All that determines whether a system is open or closed is whether or not the players know the rules. Once you know all the rules, the system is an 'open system', even if, like 1e AD&D, it was not intended to be an open system.
So the question is, supposing I ran Storyteller as a closed system, and you played a face man, wouldn't you have the same ability to impose your will on the game world even if you didn't know the rules that you had if you knew the rules? If you proposed to tell a lie, the chance that the lie would be believed is the same regardless of whether you know how that outcome is generated.