@SPavel yes, and you don't feel it's important. I am just bringing attention to that fact. You can tie in circumstance and environment again, but then it's the same level of complexity as a roll-over system. If you prefer roll-under that is fine, I have no objection to the system, and think it can be interesting to.
My issue is that you initially used it as a point in favour of a storytelling game, when semantically it's the same thing.