Our map data is often downloaded and used offline on various devices for several weeks or months. For offline data to be useful, it should at least be expected to remain unchanged in the next few weeks when you map it.
yes, by this blurb, concession for offline users does supersede safety.
i'm an editor active enough to have been granted foundation membership but hadn't known this rule; it indicates a view of osm as analogous to a paper map rather than for real-time navigation. if a change of less than weeks' length is discouraged, i can't in good conscience steer my friends away from google maps, as navigation is not a primary use case.