How do aspects and environmental conditions stack?
An example probably is useful for discussion. In the, Spirit of the Century rulebook (FATE), it gives the Darkness aspect as an example of a scene aspect you can tag to improve your sneaking roll. However, when you look at the rules for the stealth skill, it states that if a room is dark you get +2 on your stealth roll, and pitch dark gives you +4.
It seems any dark room will have the darkness aspect. Does that mean when in dark places, a character being stealthy can get an additional +2 in addition to the normal bonus? This seems weird because the character is (narratively) gaining a bonus for the same thing twice.