Similarly, if you're on a quest to save the world, you do side-quests to put it off as long as possible

I've explicitly made note this fact, that one should do quests in exactly reverse order of importance, in every cRPG I've ever played. Because often making progress on major quests will change the game (lock you out of an area, say, or kill an NPC) such that you can no longer complete some minor quests if you haven't done them already .