G'day David,
Huh. We need to go through that thing, write a tentative policy based on it and see if there's any remaining places a {{spoiler}} template is actually appropriate.
Places it isn't:
- Anywhere under a Plot, Summary, Synopsis, Story or similar header
** Anywhere the spoiler content *should* be under such a header
- Articles about fictional characters - no-one would look them up
without knowing the stories
- Any article where almost the entire article would have to go
under a spoiler
- Fairy tales, Shakespeare, classical mythology or similar cultural
canon, under the proviso of "don't be stupid"
What's left?
Unrelated articles, or articles where one wouldn't expect to be spoiled (e.g. /Harry Potter and the Chamber of Secrets/ in [[Anagram]]). Certainly, these spoilers shouldn't be present in the article at all, but if they are, I can see an argument for tagging them. That is to say, the argument for tagging them is stronger than that of tagging other articles.