(b) A theory that cannot identify the actual certain situation (provide a recipe to distinguish those situation from those where it doesn't apply) is worthless, because it cannot be falsified (see Karl Popper, The Logic of Scientific Discovery).
You sentence "sometimes it has to get worse ..." is just a meaningless phrase of small-talk. It does not help to understand anything.
(b) I am taking offense at the "has" which implies a mechanism of necessity.