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I was browsing when I found this question. In the main body, the poster talks about central plot-line, as well as a few other events that happen at the end of a previous title. While the way OP had written it was questioned, some of the events they are talking about are very clear spoilers.
I went through and tagged the correct spoilers, but was told that if information is relevant to the question, it should not be spoiler tagged. If the text is not relevant, my understanding was that it should not be there in the first place.
I have asked questions, before, with spoiler markdown. I have not received any negative feedback - quite the opposite. A lot of what I have found on meta relates to the old spoiler tag that seemed to be in place, instead.
I found this, where the best response seems to be "restrict it to major plot-line", where you have major plot spoiled, or know the fact to be a spoiler. In the case of this question, the user is asking about a major event that acts as a major plot twist in the series. They also talk about an event that only happens at the very end of the second game. I accept the user has used the assassins-creed-3, but they have also used assassins-creed-series, applying the question to the entire series.
This is my question (should clarify that I am not asking if I can edit an answer to add spoilers)
So my main question is, what is considered the appropriate use of spoiler markdown in a question / answer? Should it be used in questions at all?