Homer is dead, we live in linear time, can we please please have some progress for a change?
A notorious offender is Terry Pratchett's Discworld. When the world needs to change, it happens between the books. In any book, you know you will end up with the same status quo as when you started reading.
Even if we are talking about something happening off-world, the experience would completely change the character. They can't just resume being young, shy and ignorant. Even some PTSD would be better than nothing.